I would think the number of responses listed on the Geek Feminism Wikiato when he said it at GCDS would show that at least a handful of us were put off by the statement.
Now, I wasn't there. If I was, though? "Ugh, why do they always assume all the geeks are guys? *roll eyes*" The issue with assuming and perpetuating the assumption that we don't exist is that it creates an atmosphere where some [asshole] male developers think they are well within subcultural norms to say some pretty nasty things to female developers (when they encounter them). Things that include telling us we don't exist, crediting the men we are in relationships with for our successes, assuming we must be there to get picked up by male developers since we're obviously not there to be developers ourselves...