Americans are way off:
Karl Smith is puzzled:
What makes this interesting to me is not that people are bad at demographics. It's that I would assume that people’s immediate experience is influencing their estimate of all of America. Yet, 52% of America can’t be experiencing anything like 1 out of every 5 people I know is gay.
Kevin Drum's two cents:
I think the real explanation for this is a lot simpler: gay and lesbian issues have been getting a lot of attention in the news lately, and that naturally makes people think they're more numerous than they really are.
The Dish 