I admire John Hubbuch and have enjoyed his columns. He seems a bit astray, however, in his attempt to define racism.
We are one humanity. That is the evidence. Aristotle was, perhaps, the first thinker to distinguish between two fundamental ideas of difference. Aristotle observed that there are two types of differences, essential and accidental or incidental. The first distinguishes a fundamental difference, the second a secondary one. The human race is one. We are essentially one. Whatever culture, epoch, skin color, sexual orientation, we are still one. We have the same potential intellect and the same feelings. Culture, temporal existence, race, sexual orientations are all accidental differences. This is an observational truth. Racists are those who deny this fact. They look at race as an essential difference. They are wrong, based on the evidence, but they refuse to accept this.
This is what racism is. A denial of the truth.