Hmm, not sure where to begin really. The influences and roots of rock are as ethnically mixed as those of jazz. Most instruments used in mainstream genres of rock music (in a wide sense) originally came from a European background, the rhythmic element (however transmogrified over time) is a mix of African, American (black and white) and European influences of course.
How about the demographics of players? Okay, there are few well-known black hard rock/metal or synthpop bands, on the other hand there are tons of funk and house bands that are ethnically black or mixed; many of those have scored great success, and those styles of music have had a big impact on mostly "white" genres like disco, synth/electronic music and some metal bands. I don't really have a problem with the relative sparseness of coloured hard rock bands or white "big-band funk" acts, that's just a reflection of how music has been interacting with fashion and lifestyles. People like Prince, David Bowie or Isaac Hayes (to me they're all rock artists
in a wide sense) were deeply influenced by both white and black strains of music. And there have been racially mixed bands around since Sly and the Family Stone and Jimi Hendrix Experience...
I don't see any rock and pop bands these days trying to push off coloured fans. Of course some of their fanboys might toss around that you're not supposed to like this band if you're not white, or not dressed in a certain way, but that's not really part of the general set of attitudes around rock anymore.
And speaking of Chuck Berry, none other than Johnny B. Goode
was actually picked for the Voyager Golden Record in 1977, compiled for the curiosity and enjoyment of alien civilizations millions of years from now. Carl Sagan, who put together the record, got some criticism for including Berry by folks who thought he was "cheap" and made adolescent music. Sagan replied, "There are a lot of adolescents on the planet".