Sometimes other players are more experienced and do know more about your job than you do. Just because you hit max level doesn't mean you know your optimal rotation. Even though elitists are trying to just speed up dungeon runs for themselves and don't really give a crap about you, a lot of times their advice is solid and should at least be considered.

I'll flip this around and say that I REALLY hate running into the types of players who aren't willing to take advice and learn their roles even better. Yeah you have every right to play how you want, but just remember that 3-7 other players are in runs with you and are reliant on you to play your job to its maximum potential.

I've been a raid leader and a FC leader in FC's that are very laid back and all about teaching players to clear harder things. Nothing bothers me more than people that refuse to take advice, especially when they turn around and act rude to you and say they no better when quite honestly they don't at most times.