I'm going to turn down a date with a girl solely because she's deaf
Why do you see her hearing as a disability?
I want a girlfriend to speak to me, not type to me.
If her being deaf is a problem for you then you should cancel the date. It's unfair to you and here to continue if this is how you feel.
I think I will.
Communication is a big part of a relationship and if you are unwilling to try it is good not to waste both of your time. I hope you tell her kindly you are not interested and don't ghost her because that can be really hurtful.