It starts gently enough ... a question, posed as though the asker hasn’t already decided the answer. And then repeated, with more insistence. Perhaps some time passes. Other subjects are discussed. The matter is dropped, and left to fester.
But it invariably returns. Louder. It blocks out the common ground; the safe zones become fraught. The person behind the assertion disappears, becoming only the idiocy of the opposite, reduced to the difference between.
I don't understand people who seek out and create conflict. I don't understand why someone would want to advance the cause of hell on earth.