what does that last phrase mentioned above mean?
It is an argumentum(a quarrel; altercation) ad hominem, refers to several types of arguments, not all are fallacious.
Ad hominem
Ad hominem (), short for argumentum ad hominem, is a term that refers to several types of arguments, most of which are fallacious. Typically this term refers to a rhetorical strategy where the speaker attacks the character, motive, or some other attribute of the person making an argument rather than attacking the substance of the argument itself. This avoids genuine debate by creating a diversion to some irrelevant but often highly charged issue. The most common form of this fallacy is "A makes a claim "x", B asserts that A holds a property that is unwelcome, and hence B concludes that argument "x" is wrong".
what is the fallacy of the argumentum ad hominem That it is not always fallacious, and that in some instances, questions of personal conduct, character, motives, etc., are legitimate and relevant to the issue, as when it directly involves hypocrisy, or actions contradicting the subject's words.
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Ad hominem [SEP] Introduction
Ad hominem (), short for argumentum ad hominem, is a term that refers to several types of arguments, most of which are fallacious. Typically this term refers to a rhetorical strategy where the speaker attacks the character, motive, or some other attribute of the person making an argument rather than attacking the substance of the argument itself. This avoids genuine debate by creating a diversion to some irrelevant but often highly charged issue. The most common form of this fallacy is "A makes a claim "x", B asserts that A holds a property that is unwelcome, and hence B concludes that argument "x" is wrong".