The Point That People Missed.

Killmonger's claim of Wakandan entitlement (and the basis of his resentments) were built on his Wakandan father and that specific heritage.

His heritage was... privilege.

Exactly. He 'identified' with the part of his heritage that could claim oppression.

Not the more obvious part that was steeped in privilege.

You're slightly missing the point. His heritage is as much privilege as oppression. That he focuses on the oppressed identity is a convenient narrative to position himself as a victim (it justifies his bitterness).

Had, for example, N'Jobu met and fallen in love with a with a white woman in Oakland would Killmonger have been any less bitter? I doubt it. He has appropriated an oppressed identity based on 1) his upbringing and 2) his skin colour. The point being that the latter does not necessarily make sense given his Wakandan lineage. That you look like the people of the past who experienced hardship does not mean you get to claim ownership of their struggles. How many white people have a black ancestor deep in the bowels of their family history? Quite a lot, I'd say. And yet they do not claim ownership of that struggle despite having an equally tenuous connection to it.

He is resentful based on an oppression that he simply has no sincere connection to. Because he believes looking like the slaves means he shares their pain. He simply doesn't. His bitterness consumed him.

Give people a narrative that justifies feeling like a victim and they will take it.

Well, wasn't Wakanda closed off for many centuries?

And wouldn't that also apply to literally everyone on the planet? We all have ancestors who were privileged and ancestors who were victims of oppression. But only when you look like those who have been historically oppressed (black people) can you take any ownership of that oppression.

Killmonger's bitterness goes beyond his father. The movie makes this explicit with the opening scene where he lectures the museum curator about stealing from Africa then the aforementioned line about jumping from the slave ships like his ancestors did. He has little connection to that experience, his actual (immediate) ancestry being linked to the rulers of what is, in fact, the most privilege civilisation on earth.