Those Know-It-All Ph.D.s

Every once in a while, the following scenario occurs:

I'm in a room, full of people who don't have Ph.D.s, who I don't know very well, and someone feels the need to point out to everyone else that I happen to have one. That is kind of annoying, because inevitably everyone turns around and looks at me. Most people who don't perform research don't understand why anyone would want a Ph.D. And when these people turn to stare at me, I know what they are thinking:

"Wow, he must really like school."
"Does he think that he's better than us or something?"
"Are all Ph.D.s that ugly?"

Ok, maybe that last one was a result of my over-active imagination.

The point is that I know some people think they are doing me a favor by pointing out that I have a Ph.D., when really, they are just causing people to pigeon-hole me.