Look I main PvE with a tank. So I’ve seen my fair share of horrible players.
But some of them are learning I can get that. We’ve all been new.
My thing is this...if you come into a dungeon, and you don’t know mechanics or you are new to the dungeon...ADMIT IT AND ASK! There’s no shame in saying upfront “hey I’m new and could use some guidance.” As a tank I’ve helped many people with their first dungeon runs. I was in there shoes once and if you man up and admit it, most players won’t be angry, we will help.
DPS....if you are struggling with rotation, or struggling with damage output, don’t be afraid to ask for help. But be warned, players will help you but they won’t sugarcoat anything. Be prepared for criticism!
I and many more people will respect you if you ask for help and better yet...maturely take advice. We were all new once and at one point we all needed some guidance