It's hard when other players say something that you think you're doing right, is wrong.

It's even harder when that other players are saying it in an offensive way.

Nowadays, my expectations for PUGs are very low. If the tank can hold threat against me, I consider that an A+. If the healer can SOMETIMES push a button to heal, I consider it an A++.

If a BRD gets his Mage's Ballad up all the time, I consider it as a pass. Because at least he's spamming heavy shots as well instead of just sitting there.

I gave up giving advice. If you give advice in any manner at all, you're being seen as a jerk. So, I stop being a jerk and not care at all.