I am convinced it was because they saw each others pornography.
“Did… Did he just deficate on that woman’s chest?”
“Well, it’s kind of a- Wait- Is that a police baton?”
“I think we’re going to be good friends.”
Bigger dick theory.
We literally went from nuclear weapons to “nah- We’re good. What do you want for that stereo?” in 25 years; and yet after 500 years we still have a problem with black people.
I am utterly convinced it has to do with preconceptions about how their penises stack up against white folks.