This is a little bit off topic, but I can't help thinking of a dinner out my husband, daughter and I were having a year, maybe more, ago. I had her processors turned off, but still on her head -- we do that sometimes -- and so we were having a silent dinner, signing rather than speaking, which is kind of a nice thing to be able to do in a loud, chaotic restaurant, and a way to establish a little private bubble of family conversation, too.
My daughter was pointing to something across the table she wanted, I was signing "what" to get her to specify which item, and a woman walking slowly by leaned in and commanded my daughter firmly to "use your voice, young lady." Apparently she was appalled at the pointing and not satisfied with our parental guidance on the matter. My husband looked up and laughed, saying matter of factly "she's signing better than I can" and the woman simply turned away and moved on, trailing irritation. I remember feel offended at the time and wishing I had the right angry words to set her straight, but pretty quickly realized that this woman simply had no idea, there was no way she could have, was probably in some kind of auto-mom mode in terms of correcting children, and a word of two of explanation would probably have turned things around pretty quickly.
I guess my point is that yes, people will probably assume you can hear if you speak, just as they would if you didn't say a word, but doesn't it just take a quick correction or explanation to set them straight about it? Or if you aren't going to correct them or chase them down, does it really matter what they think?
PS Shel, my daughter's orphanage report mentioned that she was stubborn and sometimes didn't listen to her caretakers. The didn't realize she was deaf. I've often shaken my head at that assessment. But you know what I've come to realize? They were actually right.
She is a bit stubborn and terribly bossy, too, but they missed that along with the deafness.