I agree.
Now to the OP. I don't know, even though I don't think it really should matter. beside, how does her dad know you two weren't deaf? Unless you were signing about sounds you heard that they can't hear... like "Oh my gosh, did you hear what he just said?" "yeah, I heard, crazy!" type of signing. I think it's a little awkward to use signing to talk about hearing things unless you are interpreting sounds for a deaf. I guess it's a culture thing. If you are not part of the culture and don't understand the culture, they probably would find it offensive if you used their language without understanding the culture. You still part of the hearing world.
