I think what you’re really saying here is not “its okay to be proud of being white” and more that “white guilt shouldn’t exist.”
Yeah, I guess it’s okay to be proud of what your race has done, but it’s like being proud of Tom Brady for continuing to be the best quarterback. Yeah, sure, it’s okay, but it’s also super easy because of how consistently it is true; and in the case of white people this is consistently true because of outright oppression of other cultures for reasons that were reasonably rational at the time, but are nonetheless ultimately pretty messed up. There’s no need to compare this to any other race, any atrocity is bad. That’s just something we white people should accept.
Now, I’ll also say that this resembles a very uneducated view of slavery that seems to be very American also. You really can’t compare the type of slavery seen during the Imperialist period to previous forms because the rules changed so dramatically. This was most notable in the US, but even globally most forms of slavery changed from conquered people and their children, to entire races of people being declared a labor force and socially ostracized purely for their race. You can’t say white people didn’t directly profit off the oppression of other races in a way that persisted through time.
I guess what I’m saying is it’s okay to be proud of who you are, but to tie it to whiteness is a mistake.
The reason it’s great to have, say, black identity versus white identity is specifically because blacks have been oppressed. It’s something that just doesn’t work in reverse. To have pride in dominance culturally detracts from individual worth, but to have pride in individual worth despite cultural oppression will always yield a great return. The argument even falls apart mathematically. The focus needs to be on the individual, and that individual’s associations. Whiteness just simply doesn’t make sense for the individual to tie themselves to.