[georgespencer]

A few years ago I read an upsetting news story about a girl who was sexually abused for three years by her stepfather, up until the age of eleven or so. She was so traumatised by it that a lasting symptom was a fearful, hysterical reaction to sausage.

It was an upsetting, almost cartoonish detail in the story, but it might be helpful to you here. On a rational level she should not be afraid of sausage. But years of abuse meant that she was. It's sad, but understandable. It's just how trauma and conditioning work.

One doesn't need to be a victim of racism to empathise with the fact that it has a profound and traumatising impact on people. Maybe you know something about OP that I don't, but if you are right, and there's no reason for them to be talking about race in this instance, it's unlikely you'll persuade them with incredulity that they hold the point of view they do.