I assumed the 'Steve Urkel' post was making the point that a black nerd could be very well loved, and moderated it up based on that.
Also see RZA/Wu Tang Clan, Pharrell Williams/N.E.R.D. It certainly seems like some aspects of nerddom/geekiness are perfectly acceptable: video games, kung fu, sci-fi, etc. Of course, you have to be cool already for geeky things to be acceptable.