[lmm]

I don't think there's a clear bright line, any more than there's a clear bright line between being avoiding individuals you dislike and discrimination. That doesn't mean the distinction doesn't exist.

If one shopkeeper won't serve you, they're exercising their own rights and you can take your business elsewhere. But if every shopkeeper won't serve you, you're probably being discriminated against. I don't presume to draw the line precisely, but we recognise the difference.