Maybe the joke is the guy to the left is exited by simple abuse (taking marisa's hat) while the rest are like "meh". Everything changes when another guy does heavier abuse and the reactions change
Isn't the guy on the far left supposed to be a punk or something? He's got a mohawk or a thorn bush growing out of his head. I thought it was some sort of joke about people trying to establish that they are abusers saying "yeah I'd take away a Marisa's hat, and I might not even give it back!" but then what the ordinary abusers like scares the poser.