Is it wrong that I don't find black girls attractive?
Why don't you find black girls attractive?
Something about their style, i find it really gaudy.
Everyone has their preferences but not all black girls have the same style. Everyone has their own beauty and you should try to find that rather than just having a broad assumption about people of a different ethnicity.
But..
Your tastes don't align with how they look and that is fine. As long as you are not being rude about it, then there is no harm in stating your observations. It would be better if you focused on your preferences, instead of what you don't feel attracted to.