His intention is to buy meat from a meat market, should he be denied the right to buy pork from a meat market simply because a Muslim works there??
His intention is more than that. He derives pleasure from "not being nice about it" and making him handle a lot of meat. Being mean to Muslims is not the way to please God. That is imitating what Muslims do. Sin is in the heart. What are the two precepts on which the Ten Commandments rest? Find the answer to that and you can see the answer.