Unless we knew your parents, we can't answer this question.

But it could be a wide range of things, from they're racist, to culture difference, to they simply don't think it's in your best long term interests...

Heck, maybe they don't want you dating any guys... they can be pigs.

But without knowing your parents, it just people guessing.

Why ask us ?
We can't read their minds
Go ask them
Maybe it's this guy and NOT his race/heritage

I think Viper covered it pretty much very well. Best comment so far

Is it that they don't want you dating any black guy no matter what, or that they don't want you dating this particular guy who happens to be black?

If it's the first, then, yeah, racism. If it's the second, maybe they have their reasons, or maybe they just need to get to know him.

Maybe stereotypes and facts that many of them ends in jail.

Must try what you like. Period.

I'm not into interracial dating for that reason. Too much backlash that makes the relationship not worth it