As @RepSylviaGarcia mounts lengthy defense of Joe Biden, going through the Burisma allegations, GOP is listening but either
1. stonefaced or
2. dismissively laughing, literally waving it away. (Cotton, Ernst in this group.)
(He was listening, passed a note seeming to react to Barasso, but seemed to be dismissively not watching.)
They were visibly laughing. Of the back-of-classroom-quick-whisper and-laughing-as-teacher-in-front-says-something-ridiculous type.