I'd say most of us actually don't have problems with those people. The ones I'm having issues with are those who not only refuse to try contributing dps while healing but also go on crusades claiming not dpsing is the correct way to play healers, which is just outright wrong and stupid. Worse if they're "teaching" new players about it that way. It's as ridiculous as telling a new blm that it's fine to be an ice mage in dungeons.
