The gross part about this is that the person who lost their cool and insulted the OP is reportable but doing really, really stupid and detrimental things somehow isn't.

In no other situation can someone walk into a group activity, perform terribly, actively disrupt and hinder the progress of their teammates and just walk away with no penalty.

I feel like the OP should be reported for his deliberate poor play. I know there are a ton of gray areas and it's a slippery slope and all that but like this guy played badly on purpose and was actively wasting 7 other players time. That isn't any more okay than saying rude stuff in PF.