D&D Rules EVERYONE Ignores

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I am fully aware that the disarm rules exist, I just purposefully ignore them so my DM doesn’t learn they exist.

"Nobody knows why the DMG has weapon details for laser pistols and laser rifles..." It's because laser guns have been part of D&D's canon lore since 1980, when they appeared in the Expedition to the Barrier Peaks adventure module. They were considered non-busted because they rely on laser ammunition, and the crashed spaceship from that adventure is the only place in the setting where such ammo can be found (and there only in scarce+finite quantity) – the guns were deliberately overpowered as a "one time" toy that would generally be depleted of ammo either during the very same adventure, or shortly thereafter.

"Track your rations" Rangers and Druids: No casts goodberry

8:20 Objection! You fall 500ft per round, falling 1000ft into lava would give you a turn to do something, and falling 1001ft would give you two turns :)

In Xanathar's Guide to Everything it says you instantly fall in a turn up to a maximum 500ft, instantly falling an additional 500ft on each subsequent turns.

I've played Magic: The Gathering so the idea of counterspelling a counterspell is already known to me. Imagine a whole counterspell chain of the party versus the enemy encounter desperately trying to either force through or stop a different spell. My suggestion for often ignored rules; Electrum coins.

Fun fact: the ruling that makes it so that squares are circles is actually a variant rule, because playing on a grid at all is a variant rule. This forced WOTC to publish another optional rule in the DMG that gives a more realistic way of determining distances

Another half decent way to upgrade your player’s pet companion is using the sidekick rules from Tasha’s. The martial sidekick specifically mentions it can be a wolf or other animal companion

Don't forget jack of all trades also applies to counterspell and dispel magic rolls as they are also checks, which makes bards some of the best at those spells in the game

So, I like adding stealth bonuses based on size so small and large creatures get a +2 and -2 respectively. Meanwhile, tiny creatures get a +5, and huge creatures get a -5 to stealth. Gargantuan creatures get a -10 to stealth because they're the size of an F'ing three story house and shake the ground when they move. I don't care if its an invisible tarrasque its not going to sneak up to the party in a dense forest because it'll knock over trees and create a clearing simply by existing.

The fact that dim-light and darkvision isn’t on this list makes this immensely funny

I'm surprised you didn't mention the most common rule I've always seen ignored, beyond stopping the most ridiculous of misuse. Inventory management. Aka, no one really does it, at all, beyond a list of what they're carrying. The ridiculous misuse rule is generally just there to keep people from grabbing massive statues and other such things and tossing it into their packs, since that makes no sense. Unless you have a bag of holding, in which case, pretty much all aspects of inventory management is just completely ignored and you absolutely can loot entire towns without a second thought, lol

1:28 I can totally explain why the DMG has stat blocks for futuristic guns in exactly 5 words: “Expedition to the Barrier Peaks“

I’d also say that a common rule often ignored is keeping track of ammunition. Unless it’s special ammunition like enchanted ammo, most DMs I’ve played with ignore it because forcing a player’s build to be tied to a resource that could run out and constantly needs to be replenished isn’t very fun. Ranged martial characters already have to contend with being weaker than spellcasters in general, there’s no point in nerfing them further by making their main attack a limited number of uses that is dependent on being able to get back to someone who sells ammunition before they run out.

Futuristic Guns: These are included because D&D is ultimately based on Tales of the Dying Earth by Jack Vance (Heck, D&D spellcasting is called Vancian spellcasting for a reason). All the classic monsters and the like are based in a world of collapsing to barbarism as the universe collapses slowly on itself. Think like Thundarr the Barbarian. Mimics were made to protect belongings you stored inside them, Ioun stones act weird and orbit things because they are mined from the cores of collapsed stars and have weird rules with gravity, etc. Faeries being Small: Or you're playing a Pixie, which are Size S. :)

7:00 short rest spam is easy to fix: As a short rest takes 1 hour, that's 1 hour of extra prep time the mobs get to fortify their positions, call for reinforcements, evacuate the area with the loot, and so on. And if the adventurers are in a time sensitive mission, these hours add up pretty quickly. And some traps are pretty easy to set in just a couple of hours. Watch any video on Victor Charlie traps if you don't believe me.

Disarm - I had a enemy hero with a badass sword and special legendary actions that allowed him to grapple with a successful attack (to flex for story purposes) The Paladin was grabbed around the throat and lifted into the air...he Commanded the enemy to drop his sword. Badguy uses his turn to pick up the sword Paladin commanded him to drop it. This variant of Disarm went on for 4 turns...

Glad to hear someone else agrees that being winged gnome instead of an actual fairy is really freaking lame and makes it much more fun to be tiny compared to others.

Another big one is the rules for dim light and darkness. I had been running my current campaign for over A YEAR before I finally looked at those rules and realized that dim light should have been imposing disadvantage on normal sight, and darkness doing it for darkvision. And of course, by then the precedent was already set. Because nobody actually looks at that rule and just assumes "oh, darkvision lets me see i the dark!"