talking about ME instead of the topic is an ad hominem.
Not necessarily, from
Ad hominem - Wikipedia
Validity
Ad hominem is fallacious when applied to deduction, and not the evidence (or premise) of an argument. Evidence may be doubted or rejected based on the source for reasons of credibility, but to doubt or reject a deduction based on the source is the ad hominem fallacy.
Premises discrediting the person can exist in valid arguments, when the person being criticized is the sole source for a piece of evidence used in one of his arguments.
1. A committed perjury when he said Q.
2. We should not accept testimony for which perjury was committed.
3. Therefore, A 's testimony for Q should be rejected.