I think a large chunk of people have simply never read the rules. They watch a podcast and “learn by playing” with their friends. A large chunk of that subset don’t retain rules very well, so no matter how many times you tell them “you have to roll to hit before you roll damage” they might not remember.
I don’t want to say they’re idiots because that’s mean, and they’re usually having fun, but as someone who’s extremely rules oriented it grinds my gears.