I must come from a different culture. I have been to many performances and have seen interaction between the audience and/or band members. You don't sit in the front two or three rows during performances by certain comedians and expect not to get singled out, and depending on the comedian it is usually in good taste, if that is a reasonably expected part of the performance, I too have been singled out. I get that.
I think back a few years when a buddy went to see a bar band and just chill with a friend of his. The band recognized my buddy's friend as a fairly well known performer, (if you remember Max Webster), identified him and actually invited him up to perform. Although he agreed, afterward he expressed to my buddy how put off he was by such unprofessionalism. When you are made part of the performance when it is not expected, because of your status or standing is disrespectful enough, but to then be subject to a politicized speech by a grandstanding cast member is just rude. Like I said, there is a time and place.
