While intentions indeed have no bearing on whether an action or behavior is racist, I'm failing to see the institution element. My understanding is that would be in reference to racism borne out of laws and other underlying systems of a society. This just seems to be just plain racism, whether by ignorance or actually taking inspiration from those shows.
Those "free speech" types think everything is ammo. Fuck them. The notion that trying to work against racism in any form is somehow a negative because some alt-right idiots with zero concept of the Constitution might get mad is backwards as hell.
Also, don't be disingenuous. The shoes are straight up blackface. Don't handwave that shit.