** Don't request this question be deleted from answers - I think it's being asked seriously, not maliciously **
I've wondered the same thing before. After really thinking about, here's my opinion. It's just a guess.
Latin is almost like Hispanic in that it's more of a culture than a race. You could have people from Spain with white skin, people from the Carribean with black skin, people from Jamaica with Eastern Indian skin, people from Equador with American Indian skin, and people from Mexico with brown skin, who would all consider themselves Latin for example. However, the Spanish language, certain cooking styles, and Catholic holidays as well as many other similar traditions make them "Latin". That's fine to celebrate, just like it's fine for a white person to celebrating St. Patrick's Day, an Irish holiday or Columbus Day, an Italian holiday. It's even fine to celebrate something about another culture that's not even your own.
As far as black pride goes, the lines were drawn between white and black people well before we were born from everything from slavery to the NegroLeague in baseball - and those lines were drawn by white people who have long since expired. Black people in the United States who descended from slaves and their masters have a history of oppression that they overcame as a culture through solidarity. White people just don't have that to celebrate as a culture - some sub cultures like Jews or Irish do, but not white people as a whole.
You didn't mention anything about Asian groups in your questions, what are your thoughts about them appreciating their culture?
· 1 decade ago