Why are young women so hypocritical and prejudiced towards their dad's compared to mom's dating young people?

From my research, most girls would hate it if their dad dated someone their age if they were in their early twenties. On the other hand they wouldn't mind as much if it was their mom doing it.

I think this is really weird.

Why are young women so hypocritical and prejudiced towards their dad's compared to mom's dating young people?
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