Generally if you are under Difficulty Level 6 people don’t get cheesed. If you were in my squad and you did the stupidest things that could possibly be done by accident or a bit of trolling, I can still finish a level 4 mission no problem.
A handful people have the game sound playing through their open mic (default setting) which is annoying to me.
Level 6 and up take actual coordination, so some players don’t like it if you don’t bring all the “right” stuff and kick people which is a little toxic.
By and large people are cooperative. There’s no incentive to sabotage the team anyway.