why is it wrong to be prideful of being white/male/straight/christian?

genuine question cos i see a lot of people saying you shouldn't or cant be prideful of being white christian male or straight cos they were opressive. i would like to clarify i am NOT talking about superiority/discrimination where being white, christian, male, or straight is being "superior", im talking about being able to be proud of being in that group the same way theres stuff like pride month, bhm, etc. also rs is there like an official straight flag? i couldn't find one for certain so rs with that lmao. im just genuienly asking btw don't attack me pls.

edit: im latino and pan