Do you ever play as toxic as fuck as you can to the enemy team for the evulz?
I think the most disrespectful and rage-inducing thing you can do is kill them/obtain the win condition, then deliberately(make it seem as obvious as you can) walk into their territory while they're respawning in spray something disrespectfully nuanced like the wilting rose spray as near their spawns as you can get away with.

The personal headhunts and anger-induced spikes of skill/sweat have been hilarious and some of the most fun I've had in this game.