You do understand that white is a color don't you?
If proud to be white implies there's something inherently better about "white" people than people "of color." Then proud to be black implies there's something inherently better about "black" people than people "of white color."
That's precisely what I believe this "proud to be X" thought means and I reject it. Being white does not give me any claim to the achievements of other people who happen to be white.
Just because one sub-group of humans has a wrong thought process ("Proud to be black") doesn't mean another sub-groups should emulate them.