Visible "Racial" characteristics; melanin, hair texture (follicle shape), nose shape, cheekbones, epicanthic fold, etc. give a recognizable tribal association. That would mean little or nothing except that people attach subculture perceptions to the tribe. If the view of the subculture is negative it is seen as racism though it is properly tribalism/culturalism.

As is often discussed in The Commentary, it is often monolithic, and individuals are prejudged by perceptions of the tribal subculture. The visible characteristics in appearance act as an identifying uniform.

You mention the miscegenation that comes with "interracial marriage/partnerships." It will take some time for visible vestiges of our "uniforms" to fade into non-recognition since everyone is not participating. A thing that does matter and perhaps I am overly optimistic in thinking it could happen sooner is fixing perceptions. Stereotypes are the result of broad observation and can be either negative or positive (to who?).

This is where I think that black people (in America and other places) have a bit of a self-inflicted wound. I will be accused of victim blaming by someone, no doubt, but we do need to clean our own house. In an effort to resist assimilation into "whiteness", purposeful trappings of "black culture" (having nothing to do with Africa) establish a tribe where the people who seem to cling to it most strongly are people that are not the best positive examples. The most common "fear" of black people found in white, Asian and Hispanic people is criminality associated with black people with the "Gangsta" persona. If there is a disparity in crime it has numerous causes (not as simple as choosing one like poverty). Gangsta subculture is not just tolerant of criminality but glorifies it. The monolith attaches it to melanin without justification, except the gangstas purposefully create the association, a curse upon the majority of black people.

To understand why I write that it would be helpful to read https://www.amazon.com/Black-Rednecks-White-Liberals-Autonomy-ebook/dp/B003XRDBYE/ref=sr_1_1

Tribalism may always be with us, and tribes are not always bad since they are unifying within while divisive from the outside. Can we reduce negative tribal (racial) associations? It's not just a matter of fixing our own perceptions of others, but also fixing the somewhat logical/justifiable perceptions of our own tribe. I'm not just pointing at black people with that. We all have those issues.