Healer should not dps in the dungeons?

[Chihaya]

I was in the snowcloack today and some kind of bard started whining about that cause i did dps and spam holy in the aoe pulls. Nobody died in that whole 15min dungeon and just before the last boss i get kicked from the party because i did dps as whm. If i keep everybody alive do it really matter if i m doing dps? They just said "you should only heal because your role is healer if you wanna dps you should roll dps"

Wow, what a shitty party. I DPS on healer all the time and bitch about the dps doing less damage than me - yet to be kicked