If you're French, be proud of French history and culture,
German, the same
Sweedish the same...
If you're three mixed together, be proud of all three.
If you're adopted, do one of those national geographic DNA tests and find out.
But just being "white " is not a culture, it's not a history beyond the KKK, it's not an identity, it's just a skin color.
Most people agree it's racist to just call Brown people Mexicans because it erases so many beautiful cultures from all over the world.
Why do it to yourself and your actual cultures?
"White pride" is stupid because it groups dozens of cultures together and just makes them the same thing.