>>115645 (2/2)
A: "All murderers are criminals, but a thief isn't a murderer, and so can't be a criminal."
B: "Well, you're a thief and a criminal, so there goes your argument."
Harder to call this one. B is addressing A's argument, but perhaps unwittingly.
A: "All rodents are mammals, but a weasel isn't a rodent, so it can't be a mammal."
B: "Wrong! If a weasel isn't a rodent, then it must be an insectivore! What an asshole!"
B's argument is logically fallacious, and he concludes with some gratuitous abuse, but nothing here is ad hominem.
A: "All rodents are mammals, but a weasel isn't a rodent, so it can't be a mammal."
B: "I'm sorry, but I'd prefer to trust the opinion of a trained zoologist on this one."
B's argument is ad hominem: he is attempting to counter A not by addressing his argument, but by casting doubt on A's credentials. Note that B is polite and not at all insulting.
A: "Listen up, asshole. All rodents are mammals, but a weasel isn't a rodent, so it can't be a mammal."
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