He's the mouse, just outing himself. And spazzing more and more each time as he gets so mad he can't type straight.

And it all stems from the fact that he couldn't bring himself to admit that he'd phrased himself badly. He made a couple of attempts in that direction in the early comments before the sheer numbers of OMG U SEXIST! drowned him and made him feel he'd be losing face in front of all the guuuurls if he admitted it. Which results in him digging himself ever more deeper.