You're just not going to fix behavior like that. I can't speak for other countries, but the attitudes a lot of people have in America plus the anonymity of the internet alongside your character reputation not mattering in this game like it did in FFXI ends up giving us the current state of behavior. People were absolute jerks at ARR launch. Back when you'd get 1 gil at most from dungeon mobs and gil was hard to come by and Titan Hard was relevant new content, people wouldn't want to eat the quit penalty and would continually pull the boss and wipe the group so someone would quit out of sheer frustration of eating costly repair bills.

It's not a new or recent thing for people to behave poorly. And so long as the game is set up so your character reputation doesn't matter (and it really doesn't with cross-server duty finder and reputation only really mattering for raiding), nothing's going to change.