You could be correct…he may not be. Nothing he said in that tweet points either way though.
You might have a point if Trump were using ebonics or was being intentionally bad at grammar. Neither of those things is going on here.
There is a world of difference between allowing the occasional “y’all” into a work document and completely ignoring the subject/predicate dynamic of language.
Just because you might invite your homie over to the hizzouse for some spades and 40’s doesn’t mean it has a place in functional conversation outside of said hizzouse.
