There’s plenty of black people who speak well and have a large vocab and don’t sound white
Exactly, been that way since I was child, never once have I heard "oreo", "acting white", etc., I swear this mainly pertains to people that pride themselves on these things, very basic things, and as a result expect praise for it and treat it as some kind of badge of honor. My vocabulary and speech wasn't even the result of academia, it was the results of playing games, watching debates, and my family constantly moving due to army related stuff, which resulted in me never picking up a region based dialect.
Funny to see a thread made about this video, I saw it in my recommendations, watched to first few seconds and cut it off because I could tell what he was getting at. Really, what happens with people like that, is they engage with less fortunate people that didn't have equal levels of schooling or an incentive to further reading levels and as a result, yes, there are different levels of words they don't understand or are able to use. Instead of taking issue with our varying degrees of educational systems in place that create such circumstances, queue the pseudo-intellectual, ready to make some big deal out of it as a means of propping themselves up, instead of looking to help others.
Big rant, I know, some things just annoy me to all hell, this being one of them. shyt, one more thing, I have written for money at all levels of education, barring possibly graduate level, so I have a decent grasp of the language and writing, not once would I ever think to use "melancholy" outside of a literary setting. So if I come across people talking like that, let alone drawing attention to it, I'm out.
And dude didn't even use the word right, it's "melancholic" within that context.

But I will reserve that blame for systems in place that likely led to that misunderstanding.