The problem with taunt parties is more of a general problem that plagued Brawl's online, that problem being that Brawl's online fucking sucked hard.
It's like,
'Hey, I just finished playing a five-minute time against shit Ganon player from Mexico on Hyrule Temple, during which I pressed two buttons because the Ganon player side-b'd of the ledge twenty-eight time because he had potato skins connecting his Wii to his router, and his router was some form of cat, now let me sit here for an hour as three blue-haired pricks critique my max-speed and give me advice on how to walk up stairs. On Hyrule Temple'
In a world where Brawl's online wasn't pure trash, taunt parties maybe wouldn't have been that bad, and god damn it do I want to live in that world, but as it stands, taunt parties make me want to choke myself with my own fucking eyes.