Why are age-gap relationships judged differently for young men and women?

When parents go crazy and attack their 18 to 21 year old daughters 50 year old boyfriend, people support the parents, but when parents attack their young sons 50 year old girlfriend, people say they are wrong.

I think it's sexist, I would attack the old woman for using my young son.

Why are age-gap relationships judged differently for young men and women?
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