I'm sure these musicians are thick skinned or they wouldn't be doing what they're doing. Going against the norm is always going to irritate some people, and it's always going to happen or art would never progress.
At any rate, I'd bet dollars to doughnuts they would probably appreciate someone poking fun if it was clever and funny.
I had some friends in a free-form band years ago. They played an open mic night at our local pub and got booed off the stage. They thought it was funny.
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