Joseph, you don’t “know with certainty” that anything is chazer. You hold that it is chazer, and they hold that it is not. They are as entitled to their view as you are to yours, and halacha requires you to recognize and accept that, including, yes, by eating in their homes. And the halocho explicitly permits you to eat from their fleishige keilim, in which they have probably cooked the meat that you hold to be ossur. (If you don’t know what I’m referring to, do some research; it is not obscure.)
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