There's very little intersection between your opinions and the truth, but we'll get back to that *after* I bring you (kicking and screaming, apparently) to an understanding of the concept of rational, adult discourse. Even if you have the truth on your side, calling someone who disagrees with you a sexist is an ad hominem argument. You have to respect the opinions of people that you disagree with. Many people learn that in grade school.

You're familiar with <a href="http://en.wikipedia.org/wiki/Godwin%27s_Law">Godwin's law</a> I'm sure? As the wiki article says, "there is a tradition in many newsgroups and other Internet discussion forums that once such a comparison is made, the thread is finished and whoever mentioned the Nazis has automatically "lost" whatever debate was in progress." Even if you have the truth on your side, if you are reduced to calling your opponent names, you automatically lose by default.

You believe there are no inherent gender differences in math performance. That's fine. There's nothing wrong with that. But you also believe that your belief is the one righteous Truth and the unbelievers are morally inferior sexists. Because you think that way, anyone who actually discusses the issue with you is wasting their time.