Sportsman warehouse doesn't like colored from Mitchell's Plain

On 21 December 2020 at about 18h30 I went to sportsman's warehouse at canal walk Cape Town to purchase a Nike shorts, I noticed that there where small bleech spots on the black shorts and it was the only shorts on that rack and it was my size. I approached the manager I think his name is michael and attempted to ask him about those marks, before I could pose my question he told me that they will not sell the shorts to me. I don't know why he was upset but I would like this matter to be addressed please.