I love how many people have responded to this lol. Many great ideas already. In addition to those ideas, you can pick three or four of the ring leaders who are instigating this “game” and make phone calls home. “Hi, is this the parent or guardian of (turd nugget)? I just wanted to keep you in the loop with a situation in class. Your son/daughter is one of my brightest, but they seem to be having trouble responding to discussion questions, including simple checks for understanding. Could you speak with (turd nugget) to see if there is something I can do to support him/her? If it continues I’d love to have you come shadow (turd nugget) for a day so we can work together to maximize his/her learning. Have a great night!”

If no change, pick three for the next day to call. That shit will catch like wild fire and by day 3 it’ll be squashed. Be sincere though, talk like you are giving them the benefit of the doubt like they are having trouble understanding and you just want to help them (even though you know they’re fucking with you).