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They could say that, but it would be false. They did not have to enter your store. They are the ones violating your rights, not the other way around. You have no right to require people to do things they do not wish to do.
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Though technically correct, your premise has ~100yrs+. precedent of being ‘false’ (any\all ‘welfare’ [taken by the point of a gun], O’Care, Kilo, etc.).
As we are talking about individuals demanding that other individuals cater to them, I would say the precedent is only about 50 years, form the civil rights act of 1964.