Perhaps you think whether “the person who called the cops on those guys was a racist” is unknowable. We weren’t there, we didn’t get to hear the rant at the bar, whoever it was did not deliberately and publicly identify himself as a racist white-power activist.
But we know they subjected their customers to a racist experience, right?
So maybe when other people say, “that guy is a racist,” what we mean is they’re subjecting people of color to racist experiences. What they THINK they’re doing inside their own heads? DGAF.