Originally Posted by Mal
You're committing another logical fallacy, Equivocation. Just because the same word is used, doesn't mean the same meaning is used.
When you refer to beliefs being a person's character, you are using definition 1: "the aggregate of features and traits that form the individual nature of some person or thing." However, the character referred to in the definition for ad Hominem can be either of definitions 4: "qualities of honesty, courage, or the like; integrity." Or 5: reputation.
Ad Hominem is used in an attempt to disprove someone's claims by claiming the person is not be be taken seriously. Even assuming attacking someone's beliefs can be taken as an attack on their character, it is not Argumentum ad Hominem.
What was it you were saying about a backfire in proof?
I disagree that #1 doesn't also apply since saying something along the lines of 'that jew bastard' would fall under this as well and only fits under definition #1.