When parents hate your partner, is it usually for a valid reason?

I have a friend who was hated by his ex girlfriend's parents. Supposedly he's a decent guy but poor and loved her at that time. However, he got her pregnant, she quitted college, he didn't commit, they broke up and their son is now 4 years old. He pays child support and sees his kid often but it still doesn't take away the fact that he left her single mother. What girl's parents are going to be happy about that?

The girl's parents obviously hate him and are only being cordial with him whenever he sees his son. I'm speaking as a married man myself, with our 1 year-old daughter. If a boyfriend claims to love my daughter and that she's the love of his life, only to get her pregnant, make her quit college (destroyed her future), never marries her, makes her a single mother, why would I like a man like that?

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As a father of our baby girl and husband myself, I can now see why that girl's parents hate him. I can see from their point of view.
When parents hate your partner, is it usually for a valid reason?
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