If I purchase tickets to see a Broadway musical, I want to hear the performers sing, not an audience member. This wasn’t Rocky Horror Picture Show where audience participation is part of the draw.
Beobert was singled out. The cast/venue of Hamilton deliberately shamed vice President Pence during their performance, if you recall.
It is more believable that the venue chose to embarrass Rep Beobert, than it is to believe she was acting belligerent.