Personally i've not experienced any bullying. Besides talking strategy, congratulations and things like that. I haven't really seen any talking in chat while doing duty finder content. I can't say i've been a perfect healer either, there has atleast been a few instances where players could have complained about one mishap or another but not a peep from any of them. Everyone's too busy brushing themselves off and charging back into the fight to get personal with each other.