Ed Morrissey

He did later come back and finish the show, but the damage may have already been done. The word has spread, and one has to imagine that only the die-hard fans will bother buying tickets.

However, to be fair, a lot of performers want to tell stories between songs. I went to a Herb Alpert show in 2016 in NYC that was exactly like that, filled with great music and wonderful stories. The difference is that those stories were about Alpert's life, not polemics about policy and society. If Mellencamp was giving them the latter, I can understand why people may have been annoyed. 

But still, I think Mellencamp should expect proper etiquette at these events, and should receive it too. If you don't like the show, leave. Don't be a [expletive] and ruin it for others.