I don't really think his concept of a nerd works, since he lumps in lots of extraneous charateristics and values.

I think a more explanatory description would be, a nerd is somebody who is primarily interested in technical questions. That predisposes nerds to avoid ambiguity - but by no means excludes nerds like literature professors, who are absolutely obsessed with ambiguity.

It's generally a better idea to categorise people by priorities, as opposed to preferences - since preferences tend to be very variable.