I'm glad you brought the legal ramifications of this to Google's attention! Here they were just blithely going around instituting policies without any sort of labor attorneys providing counsel, so it's a good thing you showed up to set them straight (no pun intended.)
Seriously, though, as a straight guy, I would never complain about this. I'm not even sure you could win a discrimination lawsuit, since your net income is the same. But the tax is unfair, and I don't want to be the guy with "loves to take advantage of his privileged status" on his resume.