Just wondering......if this is normal......

I'm enjoying the game so far, but every time I use the call to duty, to do some dungeons o_O Peoples attitudes are pretty terrible.

Out of the last 10 runs 7/10 people are going crazy, when were not skipping certain mobs, or like if your not running through dungeon fast enough.

I mean I even mark my targets as a tank, and people say I'm just wasting time.

I'm 39 Currently.......Is this gonna keep happening till 50, will this just keep getting worse?

Should I re-roll from tank, to healer maybe dps? Is this normal in this community?