New guy here...Sounds like you're on the right track.
If he gives you any more crap, you might want to seriously think about quietly moving at least to another zip code.
And maybe even changing jobs...verry quietly. That's what I'd tell my daughter, anyway.
Regarding playing a less than desirable guitar:
I saw a special on the "Bravo channel" several months ago about
current Mississippi delta blues players. Those guys were a joy to watch because of the emotion they poured into their
music. The guitars I saw them using were obviously all they could afford. I'm talking Sears & Roebuck here, I think one guy played an old Peavey T60, and none of them were playing ES 330s or Les Pauls or even Strats.
Just remember that when it comes down to it, your music and your sound, emanate from within you.
Good luck to you!