First of all, regardless of how badly someone is playing, on stage in the middle of a gig is not the place to do this. You may think the guy is ruining your gig, but the fact of the matter is the audience may be blissfully unaware that anything is amiss. All gigging musicians have had nights when they thought they played poorly only to have fans tell them it was their best gig ever, so you just never know.
Secondly, you're there for the fans, and an action like this is terribly self-indulgent. Give the fans the show they paid for, and I don't mean something that's better suited more for Ultimate Fighting than music.
You wanna fire somebody? Great, do it after the gig. The stage is not the time or place. You can read more about the social media aspects of this over on my Music 3.0 music business blog, since both the band and the drummer replied with some videos that were very astute from a PR perspective.
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