The article is well written, but there's some odd stuff in there, like

"Be that police officers or the descendents of those who hung us from trees with smiles on their faces, I want to limit any interaction with people who seek to harm me or my loved ones."

That's not out of context either. There seems to be some implicit definition that all white people == people who seek to harm me.

Doesn't matter who's the majority and who's the minority, it's still a racist thought process.

Nope. Racism is a domination system, so it _does_ matter who’s the majority.

That distinction might be interesting if you're defining systemic racism but otherwise racism is having preconceived notions about a group, or attributing qualities and flaws to a group, based on race. That's exactly what the author of that post is doing, lumping all whites people in a single group, ignoring their multitude of opinions and experiences.

No. The author of that post is denouncing systematic racism and as such the domination of white people over minorities. That’s why they must talk about white people as a whole.

White people are less than 10% of the world's population.

When we talk about racism and "white people" domination we usually refer to the occidental world; it doesn’t make sense in the whole World because there are too many different situation, whereas in Occident it’s pretty clear which populations are oppressed and which one isn’t. This is especially relevant on HN because readers here are mostly young white men.