BookTenTiger
He / Him
Not true in my experience. I only play with adults who act like mature, responsible adults. Expectations are clearly communicated, differences of opinion are respectfully voiced/heard, snd in the very rare event of a real disagreement, it can usually be handled in private.
Any player who continues disruptive behavior past the frank discussion phase is simply no longer a part of the group.
I work a lot of hours every week and I’m glad I’m in the situation where I can take a half day a week to enjoy this hobby. I have no desire to spend any of it teaching someone how to behave like an adult.
I think we may be defining misbehavior as two different things. To me, a misbehavior is a disruption to the flow of the game. It's everything from a player checking their phone during the game (which I am guilty of), to someone not looking up the rules of their own character, to disagreements on rulings between the GM and players. These things happen because we are human beings gathering together to play the game, and they happen no matter the maturity of those involved.
The most obvious misbehaviors are the ones that bring the game to a screeching halt: the tantrum, the racism, the cheating, etc. That's a whole other level of misbehavior that is often solved by controlling who you play with. These ideas are more for when the husband of the paladin wants to join in, but refuses to read the rules.

It is absolutely not the GM's responsibility to teach new behaviors, give therapeutic advice, or manage etiquette. However, for those looking for tips and tricks on how to help curb these behaviors at the table, I thought this listing would be useful.
I mean, we do have a 28 page thread right now called As a Player, why do you play in games you haven't bought into?. So, I think this is a topic GM's and other players would be interested in!