Is it sexist for a girls dad and bro try to intimidate or threaten or bully there daughters boyfriend, and have partial control or tell her she can't?

I don’t really think it’s “sexist,” I think the right term would be “protective”
is it good or bad. its a pretty normal and natural guy thing, but girls dont like it.
It’s good to be a little protective and stern, but it’s bad to be threatening and scare off anyone. Girls get embarrassed by it.
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