[AndrewC]

Now you're just trolling.

Hey, it was you that threw the word into the discussion. And you didn't address the other part. Liar.(another ad hominem, even if true)

[Petronski]

Ad hominem is an attack on the person having nothing to do with the argument. The charge of "liar" is directly relevant because it directly addresses the credibility of the speaker. It's called "impeaching credibility" and it is NOT ad hominem.

If I say Havoc is FAT, it is ad hominem because it is irrelevant, but if I say he is a liar (and if that statement is true), it most definitely is not.