So, can we just ban damage meters already.

[Goji1639]

Guess what! The other 3/7/23 people in your run might just be there to have fun aswell and your poor performance might just be whats hurting that right now! The "Its just a game and I'm just here to have fun"-argument is just as bad as "you dont pay my sub!"
Nobody enjoys running dungeons with someone who doesnt care about their performance and the groups-effort either.
Again: I agree that there is no need to be condescending about it, but as already established: That doesnt require a parser and is already reportable.

(...and after that report I'd still consider it a good idea to make the best out of the situation, do a sanity check and see if you're playing your job well or if there was some truth to their claims after all...)

This is a story game that forces participation in dungeons. No, not everyone is going to care about performance. People running story content as dailies are compensated for that, so honestly just suck it up.