Had the same problem. One person had joined FC and was beligerently aggressive towards calling people out on any little thing he didn't like. He was OT and we were just trying to clear turn 7 then. I couldn't take it anymore and muted him on vent and blisted him. But I think his crap still showed up in chat when we entered.

He ended up rage quitting in a few days. But I couldn't understand why his chat still showed up for me even though I blisted him. /shrug