Why do we eat non-Kosher foods?

Hi, I know someone who is a Non-Denominational Christian, who believes that the miracle mentioned in Acts 10 means that all peoples, and not all foods, are clean. After research, I cannot find anything to convince him otherwise, as the chapter itself does seem to carry that point. Could you give me some help? I assume that in order to visit the Gentiles, they would have to eat their food at one point or another, but I need something more convincing than that.

Thanks

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