Actually, I was harassed for doing DPS as a tank.

Also for using Direct Hit & Strength gems on my gear.

For adds I'm always in Shield Oath because I like to pull many together. I only use flash when running trough them and 2 more times when I've rounded everything up and then just use Fight or Flight and spam Total Eclipse, when 3 or less enemies I finish them off with Royal Authority combos or Goring Blade if they are going to live for 6+ seconds and alternate my buffs of course.

On boss I rush in with Shield Throw > Fast Blade > Riot Blade > Fight or Flight / Goring Blade. 2 times RoG and weave in CoS & SW between GCD's and a last GB to get a new full effect duration running with the last 3 seconds of FoF.
After this I do 2 more RoG and then I change to Sword Oath, Refresh GB and then use requisecat and spam HS untill MP runs out, refresh GB and spam RA.

Now the player harassing me was a DPS player. First he said why I was using Sword Oath this was during a boss fight so I didn't really responded, then after boss was dead he was asking why I was using 'DPS' gems and that these are for DPS jobs and that I should learn H2P and use 'tank' gems and that I was doing more DPS then him because I was in DPS stance so healer had to heal me more and so couldn't heal him and he died (he died multiple times from AoE puddles and pretty much failed every single mechanic).

The healer had no trouble to keep me alive and didn't complained (even had time to DPS too) and I never lost emnity. I try to do as much DPS as possible to speed up things but apparently I did something wrong?