Butters walks out the bathroom and says to the other guys:

"You guys think Cartman is the only selfish piece of crap at this school?! YOU'RE ALL FAKE AND STUCK-UP, AND NONE OF YOU HAVE THE COURAGE TO TELL JIMMY HIS JOKES AREN'T FUNNY! THE ONLY PERSON WITH THE SENSE OF DIGNITY IN THIS SCHOOL IS KENNY!"

He yelled at the other boys before slamming the bathroom door shut again