Why do most fathers hate their daughters boyfriends?

PokemonLover
On the movie "College Road Trip", the dad was overprotective of his daughter Melanie and the other girl's father attacked her fiance for saying their engaged.
I mean I understand they're protective but it's like they don't want them to grow up. When my sister had her period, dad was like, "No. Already?" My brothers and I were the same way but let them grow up. When I was dating my first girlfriend, her parents didn't really like me at first and her dad was an asshole to me. He kept trying to scare me and keep his daughter and I separated. I'm a nice guy once you get to know me.
Her dad even told me, "I hope you're not thinking about sex with MY precious little angel, because IF you do, I got a 40 inch shovel and I ain't afraid to use it!"
Why do most fathers hate their daughters boyfriends?
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