Me too. Sales people in strange stores give me rude looks all the time and I realise they have been hollering out across the store at me. Oh well.
The more hearies that I meet, that do not know anything about the Deaf, I am surprised that more of us don't feel invisible *all* the time.
Fortunately, the hearies that I care about are interested enough to know as much as they can and a common reply is, "Wow, I had no idea!"