You don't like talking about white privilege because some white people feel like they don't get enough credit because they're white. Meanwhile people of color suffer from real racism, both colloquial and institutional. Sure, it's socioeconomic too, but that's because for many, they're 3 generations from having the right to representation and 5 from having any human rights at all. And states are STILL racially gerrymandering congressional districts to minimize minority impact while doing everything they can to reduce the number of minority voters at the polls, both through voter ID laws and closing voting locations to make it harder for minorities to get to the polls.
Every single black man who has "made it" in America still sits his child down before they get behind the wheel of his car to go over how they should deal with the traffic stop he is bound to get for being black. And I guarantee you when that kid goes into a convenience store, the clerk is watching him over the white kids in the store. Those same white kids never have to worry about getting told to go back where they came from, whether they're first generation or 10th.
No, it's not just socioeconomic.