But why should YOU be ashamed? It's not something YOU made. It's not your responsibility.
If I was German, I would not feel ashamed by the Nazis. I wasn't even there at the time! Maybe I would try to understand how they came to power, and learn to be a better citizen.
Since I'm Italian, should I be ashamed that two millennia ago the Romans conquered and colonized most of Europe? That would be just ridiculous! :-D
Can it be that you absorbed somehow the feminist message saying that ALL men should be ashamed for the actions of A FEW men?
But if you think about it, it doesn't make sense. One is only responsible for his own actions (or lack of action).
That kind of messages are insincere and manipulative. Better beware.