Having leveled and geared up a tank first I haven't had to deal with this much since switching mmos. I've run into a few strings of tanks the last few days that will not take advice even if it's extremely basic and sugar coated.

Things like face mobs away from the group, move only when you need to so you know where the danger zone will be and having large mobs half in walls reduces dps.

No matter how I try to approach it the majority refuse to listen. The most common response so far is that it's my problem and to leave if I don't like it. Healers and caster dps often jump in with a similar response even though it's making thier job slightly more difficult as well. It's rare but, occasionally some one will try to explain as well.

It's making the 40-50 leveling range very aggravating and I have no idea how to talk to people who feel any advice is an insult.