I think there are also a lot of people who don't realize how their words hurt others and, worse, don't believe their words can hurt others. (I have a female friend who works for the City of Olympia. While I don't know if she's ever used a manhole, I certainly have no reason to assume no woman ever has!) I think we can take limiting our word choices too far, but I think being a little more careful of them is better than blindly using words without thought of their consequences.
"Now everyone was giving her that kind of look UFOlogists get when they suddenly say, 'Hey, if you shade your eyes you can see it is just a flock of geese after all.'"
"You can't erase icing."
"I can't believe it doesn't work! I found it on the internet, man!"