Hi Jeff,
Pardon me but, 'what a crock'! And for an open mike no less. Sheesh...
As with those who have said something along the lines of it's one thing if it's a cover band and another thing if it's an open mike. I say exactly! The way I see it is the ahem...'dude' (intentionally not capitalized), should have been grateful you've played the gig for four years. What a maroon. I've hostessed an open mike for over a year now and if I had someone coming in week after week, to say I'd be appreciative is a gross understatement. Bottom line is, his loss, your gain.
This really isn't a loss for you, it's opportunity to do better. And believe me, even if it's playing by yourself, you'll be better off in the long run. Personal practice is opportunity to succeed. IMHO, playing with this bozo is the road to nowhere. As John just said, Life's too short and too precious. Go play some music.
Best Regards,
Kimberly