Squid Parties ruin the game. Period. I bought the game to play and enjoy the game the way it was intended. I don't get a whole lot of time to play the game and I use it as a way to destress from the day and wind down. So when someone ruins a match by AFKing, Squid Partying or some other randomness, it tends to piss me off. I want to be able to enjoy the game, not be irritated by those who want to ruin it.
Luckily, it does not happen nearly as much in ranked as it does in turf wars, BUT I usually play turf wars after having a salty experience in ranked and I need or want a break . . . .