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In my experience, PZ is not worth arguing with, because he never engages in good faith, and isn't open to evidence.
It is not an ad hominem fallacy if you are not claiming the argument is wrong because of a person's trait(s). Advising against considering an argument due to a person's trait(s) is not an ad hominem fallacy. And not all claims about personal traits are ad hominem fallacies.
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