Usage context for "bestie" and "sweaty"?

[pauamma]

I just came across https://twitter.com/LiveNudeJulia/status/1392153700722954241 and the quoted thread, which refer to context for "bestie" and "sweaty", possibly in US dialects and or the African-American community, and I'm unable to figure out why they seem to be objecting to mainstream use of these words. Checking several dictionaries (including Urban Dictionary) didn't turn out any obvious clue. Can someone elucidate or point me in the right direction?