Several others have said the same thing, but I'll share from my own experience.
I wanted to race. My coach coached a local club and sent me out to ride with them. I felt like they rejected me. So I rode with another local club and felt the same way. And then a third. I finally decided to start my own club (
Velo Girls).
Well, over the years, I've gotten to know a lot of men who race. They'll say what some of the other women have also said -- no one is rejecting you or judging you. They don't really care. They probably don't see you as much a threat as they do the other men. Men are just different. They aren't welcoming and encouraging. They won't mentor you. They might think you're cool for coming out to ride with them, but they're not going to tell you that. They just want to ride their bikes and win the town line sprint.
Now, if you did attack them, they'd probably take notice. You might even gain some respect. But don't take the way they treat you personally. They probably treat the overweight guys who get dropped the same way. It's not about you -- it's not really about anything.
On another note, I would totally encourage you to start a woman's ride. Even if it's a recreational ride, you'd likely find women who aspire to race and are fit and fast. Who knows where that might lead.