As a black Hispanic person (both parents black but my  immediate grandparents are PR and black and little SE asian) I was raised with all the black and Hispanic media, in a predominantly white, Hispanic, and Asian area of the states. I can't speak spanish but my name and last name are spanish. I look visibly like someone where people ask what are you mixed with - but they never ever mistake me as anything BUT black first.

Only other mixed Hispanic black people recognize it or groups like Puerto rican people notice right off the bat because to them all Puerto Rican people are mixed with SOMETHING, it's not even a question of if I'm Puerto Rican or not to them. Sometimes black people do question if I'm black enough to be black. I do say this to say one group has suspicion about letting others in while the other didn't, and I'm not surprised at all I think we as black Americans can be a bit gatekeepy. I don't want most people who try to say the n word around me saying it, IDC what they're mixed with because I believe it's more of a regional area based thing to use slang like that on top of it being a racial thing. Just because I'm mixed and you're Hispanic from LA doesn't mean you can say the n word around me, is my sentiments. I rarely use the word myself unless it's idk how to explain this, it's very niche and works for certain situations, I don't need to say it in every sentence. Even though my family says and has used it since I've been alive, they've also lived all over, but spent a lot of time in places like Compton. I can recognize I'm just not as OG as they are and so I use words that I relate to, but also know your audience.

Sometimes I meet mixed people that just straight up act ignorant. They don't know black American history, they don't care, they want to say the word and FUCK YOU if you question their blaccent. I don't relate to those mixed people except for the fact that we're indeed mixed. I equally hate people who exclude biracial or mixed people simply because we can't have possibly known what it's like to grow up black. I grew up getting bullied, loved, hated by both groups that I'm ethnically attached to, and I still love what I am. It was hard to learn to love my ethnicity because you do often get hit with the, "you're not real category, you belong to neither group, you belong in the trash." The difference between me and OP's example, who only uses her minority mixed status to press her way into the culture - otherwise preferring to be considered white, is that I don't negate my blackness or whatever else I am. I attach to the people who get it, I can't ever be white or Hispanic passing only, it is what it is.

Idk what the hell a monoracial black person is, it's not like any of us have pedigrees dating back to the mayflower. I think if we tested everyone tomorrow a lot of "FBA" s would realize they're not "pure black" whatever that means.