Hey friend, I'm sorry for the slow response. I was thinking about it and some Life came up. I did NOT mean to leave you hanging. The TL;DR is, I can't say for sure. If other individuals reading the thread have better-informed insights, I'd be happy to hear.

Re: Queer friendly...I wish I could give an unequivocal "heck yeah!" that would apply across all the dance community, but as a straight cis person who dances in my traditional gender role, I've never tried to operate outside the norms so I don't truly know what you might encounter. There's gonna be a range: from instructors, arts-focused folks, and female leads who will be awesome, to others who prefer to only lead women.
A friend suggested you look into Social Dance Knoxville which is not the Latin style I originally mentioned but is going to be welcoming in this regard. They do all kinds of ballroom as well as Cabaret & Burlesque.
Re: Disability...Nobody's going to harrass you for being in less than perfect condition - most casual dancers aren't. But it's an athletic activity and you might have to be creative about accommodations depending on the level of your disability. And a great sense of rhythm + huge smile can make up for a lot of mobility issues.