It’s really not that many words. If you google ableist terms, you’ll find maybe what, ten? I think it’s reasonable to stop using ten words. What you’re saying by refusing to do so is that you don’t think that some people or groups deserve respect.

Nobody is asking you to protest, or to write letters, change your diet, change what you do with your free time, change your job… Just stop using a few words. Hell, I’d be happy if you just considered cutting some words out of your vocabulary. If you’re at least willing to think about it, I think that’s reasonable. :)