In andrews own statement addressing the retconned glitch text where john claims dave's bro is "a white guy [...]" he said the following:

"First of all, here’s what’s true: I was being quite serious when I said I viewed these kids as non-racial from the start. It is a fact! In the earliest pages, when people asked what race they were, I just said 'N/A.' 'Don’t care.' 'You decide.' "

Obviously, many took this with a grain of salt as in the comic itself, all of the textually white people in the comic ( ie. bing crosby, colonel sassacre) are depicted as being #ffffff white, whereas the the textually black characters (ie. bill cosby, charles dutton, donald glover, snoop dogg, ETC.) are always shown with actual colored skin. The dissonance is apparent and regardless of intent from which we can only trust the word from the guy who actually made the comic, the casually white perspective that the comic is told from tells another story.

But he did say “you decide.” and to that end we, the readers, are deciding.