Why is it that women hate generalizations?

It seems we can't have a general question about women without some ladies jumping all over someone for making a general statement. Why are women so averse to generalizations? Life and human beings are understood in generalizations. If we ignored generalizations we would never understand anything about the human race. I know, I know, everyone is different, but there are commonalities as well.

Why are women so sensitive about them?
Why is it that women hate generalizations?
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