I agree whole-heartedly. The vast majority of social behavior is learned, not inherent, and some people are just better at picking it up than others. I suspect that geeks, who usually have the experience of learning scholastic subjects with ease, get very distressed should they realize they're having problems learning the social stuff because it implies a lack of learning ability, which is what they pride themselves on. In other words, not getting social stuff is a blow to the ego, which makes it difficult to get over themselves enough to actually learn it. There are geeks who get social stuff as readily as scholastic subjects, and geeks who don't have "picks up new subjects with ease" as a point of identity/pride, and I would bet they tend to have fewer Nice Guy problems.

I've never found you socially difficult, btw. To the point where I'm occationally confused when you bring it up. I suspect my metric for such things is calibrated oddly, however.