Mark,
Love your posts, very funny and real life! What you're describing is the norm, for everyone.
The Cardinal rule is the 'customer is always right'. It's tough to suck it up and I'm no angel (there are some that will never have me), but usually those type go from place to place to place. I wait until they are replaced and let the other musicians deal with the hassle.
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Yamaha 920 / Yamaha DGX-670 / Maui 5 Go (2) / Senn e935 / Sony C80 / Tascam DP24sd / ATEM Mini Pro switcher (studio)