Because 90% of geeks have /self-diagnosed/ themselves as having aspergers and they take any criticism of it as a personal attack on them and their "illness".

Don't worry, something else will come along that is way more trendy in a few years and these same people will move on to claiming they have that, instead.

(Obviously not claiming autism itself is not real and not a legitimate and difficult problem to deal with. I shouldn't have to disclaim this, but I'm obviously talking about the Slashdot type crowd that has convinced themselves that because they are detail oriented and are sometimes awkward in crowds, they have aspergers and constantly talk about it.)