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I intensely dislike accusations of ad hominem from people who don’t understand what ad hominem is.

Hello professor, I read your blogs from time to time getting different perspectives on important issues. The recent article about Krauss, there is allot of ad hominem, is that a good strategy to sway people towards a viewpoint, instead of arguing the specific points ?

He is referring to this post. It would be ad hominem to say “Krauss is a harasser, because he was a physic professor.” It is not ad hominem to compile a collection of observations and assessments by his peers that directly corroborate the accusation.

The idea that presenting evidence is an ad hominem fallacy is a defense used by people who want to suppress the evidence.