It sounds like they think they can poke at you because you're the least experienced, and they know they picked you because they knew you.
Trouble is, they're being hypocrites. Either they want you in the band or they don't. If one is complaining he can't hear the rumble of bass on stage, but refuses to have your bass sent to his in-ears, tell him to STF up. If he ain't part of the solution, then he's part of the problem. Same goes for the others.
And who the hell carries your rig in .... them ? No, it's you , so the size doesn't matter. ( matron )
You need to start fighting back or get the hell out of dodge