I used to be all about taunt parties. I still remember my first one, playing with rolling crates on Bridge of Eldin with a Link and a Zelda.
But now, I can't really stand them that much anymore, because now that's all I seem to find. I can't go online hoping for a nice little friendly match against random people without coming across a group of crouching, taunting time-wasters. There's no one in my area I can play with, most of my friends don't have the game/no Wi-Fi, and it gets boring fighting CPUs that seem to aim for me most of the time.
Occasionally, I'll partake in the nonsense or help them beat a party crasher (because from what I've seen, most people involved in taunt parties are really bad). Sometimes, I even take them all on myself (mainly after defeating the crasher). But usually, I'll leave and wait until I get a group that wants to play normally.
I REALLY hope that SSB4's online will have something that deals with this.