I agree that it is definitely a nastiness problem, so if you were going to add one of these two types of flags, I'd recommend 'uncivil' over 'frivolous' I thin

I agree that it is definitely a nastiness problem, so if you were going to add one of these two types of flags, I'd recommend 'uncivil' over 'frivolous' I think the right consequence for someone who accumulates too many uncivil flags is to have the server start to throttle their IP. This allows it to be a gradual, linear and temporary disincentive to poor behavior, rather than a binary response. Just dropping the connection is also de-escalating relative to alternatives like sending a message only to that user. I could certainly see people absolutely exploding when they see that they've been flagged as uncivil. Add a message on top of it, and things will definitely get out of hand at least some of the time. But if the connection starts to just get dropped, they maybe keep refreshing, maybe go somewhere else.