I assume most people know this but there are some insults that when directed at Black people carry extra racist baggage.
"Always Late" and "Low IQ" Going on about how a group of Black journalists started late (and it turns out this was a lie) is ...
I think most people picked up on this but had not seen any media mention it *directly*
As for "low IQ" he almost exclusively uses this on Black people who are highly educated.