My favourite that I was asked was "why do you wear a hearing aid?" my answer, to keep my ear warm.
10 things you shouldn't say to a deaf person.
1: Hey come & listen to this!.
2: Can you please turn the closed captions off?.
3: If you didn't hear what I said, then forget it!.
4: Sorry, we don't employ people with your type of disability. ( had a personal experience with that)
5: I'm sorry to hear you're deaf.
6: Hey did you know, that guy/girl wears hearings aid?.
7: What's it feel like wearing a hearing aid?. ( been asked that a few times)
8: You're voice is quite good for a deaf person.
9: Are you sure you really need them hearing aids?.
10: Is there anyone else I could speak to?. ( been asked that just based on the fact he saw I was wearing a hearing aid )