For arguments sake, I'll interject this, because I live in the south and have heard a lot of this stupid ass question this week. "Why is it okay to have black pride and not white pride?" there is a simple reason for this.
As a member of the white community you had the luxury of having your culture retained, there were records of when your ancestors came to this country, where they came from and what your original heritage is. For 200 years African slaves were ripped from their countries and families, and brought here to be bred for slave labor for generations. Their original names, country of origin, and culture were stripped from them as they were seen as less than human. The one commonality that current generation African Americans share is that most of them are descendants of slaves, they don't know whether they are Senegalese, Congolese, Algerian, Sudanese, Ethopian etc, they do not have a culture they can feel proud of. They find strength in banding together in "black pride" because that's all they can do, they can celebrate how adversity has formed some amazing citizens that have gone on to do great things.
Now when you say white pride, your culture was not stolen from you. Your identity was not stolen from you. If you wish to have German pride, and celebrate the rich history of your ancestors, by all accounts feel free to do so. But do not ever think that having pride in being fair skinned and "not brown" is something that is morally equivalent to finding something about a horrible history of disenfranchisement and turning it into a positive. It's false equivalence at its finest. If you have to ask "what's wrong with white pride" there isn't much to say to you, your lack of understanding of what this country has done to an entire race of people is intentional, you are willingly choosing ignorance to defend your inherent bias.