Totally reasonable and that staff member should be fired. The staff are there to support you. There is nothing wrong with you (except for the disability!) you are a totally normal human being who demands the respect of a human being and fundamental to that, is our right not to suffer discrimination.
OK my wife is in nursing home and the staff have no problem with my pronouns and they totally understand or at least accept, that my wife refers to be as a male. I am totally and utterly OK with that. I'll always be her husband and I will never walk away from that.
I agree with Jenny, work and society have had very little trouble. One guy at work misgenders me regularly and last week I told him in front of the entire staff that if he did it again I'd cut his balls off, dip one in silver and one in gold and he can wear them as ear rings so he doesn't forget.
He went red and felt humiliated, he hasn't forgotten since and if he does I'll humiliate him again.
Let us know how you get on. We can always email bomb the place to support you