http://en.wikipedia.org/wiki/Audism
My "favorite" form of Audism is when someone talks to me, and doesn't bother letting me read their lips, when I ask for clarification, or for them to stop turning away {or stop eating}, I will usually witness a familiar body language followed by a wave of their hand while saying "Never mind"....About 85....95% of the time, this will successfully tick me off, that person is basically telling me they can't be bothered with helping me understand.
If I'm in a snarky mood, I'll return the favor.