Not just winning, but setting records, lol.
While I wouldn't put it the way Mdot did, I tend to agree that we are who we are. That being said, I'm 100% certain some (few) people grow up feeling as if they're the other gender. But even if that's the case, I'd encourage them to be themselves in the body they have. Act how you genuinely are...the surgeries and hormones may just be a gigantic band-aid.
As for the former men in women's athletics, they should have their own division. That's not based on prejudice, it's based on science. And I'm afraid if they did have their own division in myriad sports, it'd be too small to be maintained. It would be unfortunate, but valid, and may open some people's eyes to how few of these individuals there actually are.