I don't want to sleep in a twin bed on vacation
I'm curious why you'd not want to sleep on a twin bed?
Sleeping on a twin bed makes me claustrophobic
It's understandable to want to be comfortable on vacation, but you should be grateful to have a nice bed to rest in. If you fail to find other accommodations you may end up without a place to sleep at all.
I always have to deal with bullshit.
That sounds rough, but I am sure that you could survive a few nights on a twin bed. If worst comes to worst then you could try sleeping on the floor instead? Or ask for a replacement room with a larger bed?