I have yet to encounter this being used as a troll tactic; and while I won't deny that this can happen, I think the people who use this as a basis to call for a removal of the ability are grossly overblowing any real "issue." I see Provoke being used as a 'trolling' tactic to mess with boss positioning who happen to have cleaves. Can we change/remove that too? /sarcasm.

I imagine that you can deal with healers that you're positive are doing this out of spite the same way as any healer who refuses to actually heal anybody or any player who makes it their goal to be an active hindrance: Vote kick.