It’s absolutely NOT a size thing. MOST black men are average, which is why it’s average. Tons of other ethnicities have varying dick size as well, including large.
It’s 100% a racist application of the “no thugs” stereotype, even by black women. It’s kinda fucked up.
it’s also a good way to sniff out an LE sting, because the cops wouldn’t use racism to entrap one ethnicity over another.