Just because the argument has something about the person himself doesn't make it ad hominem. Saying "He's a shitty dresser, therefore don't listen to what he sa

Just because the argument has something about the person himself doesn't make it ad hominem. Saying "He's a shitty dresser, therefore don't listen to what he says" -- that's ad hominem. Past proof of his reasoning abilities (or lack thereof) are totally fair game, not ad hominem at all. Instead of an AH attack, OP uses a commonplace (we all believe in evolution here on HN) as well as appeal to authority (in reverse). Please brush up on your rhetoric skillz.