Stack Overflow has always had a bit of a Microsoft bend, owing to the fact that the seed audiences came from Coding Horror and Joel on Software. Still, it's always been a place where you could fully participate no matter what language or platform you program in or on.
The Generalist badge, however, rewards participation in the most popular tags, and of the top 40 tags, 11 are Microsoft technologies:
This means that someone that doesn't develop using Microsoft technology has a distinct disadvantage when it comes to the Generalist badge. A quick perusal through the list of those awarded the badge reveals that the majority are active in at least one of the above tags.