While people in actually diverse places (southwest, south) getting along or working though differences. (Open borders/illegal immigration being different than racial diversity).
A lot of the vitriol and outrage comes from people outside the states that look in and spin some story about there being a caste system of sorts, but there are no borders inside US.
It mostly comes from countries that are small and not diverse in culture or race, so they see that over half of the convicted murderers is black and conclude that police is racist.