Presumably because it is very analogous. You are essentially saying Dr. Mike shouldn’t be trusted because he made a bad decision. That is extremely similar to saying you shouldn’t trust a doctor’s advice because they happen to smoke.
> Further, an ad hominem is when a person attacks someone's character without any base.
No. An ad hominem is when the person is attacked rather than the argument. A terrible person can still make a perfectly sound argument. Calling them terrible doesn’t change the argument, even if it is emotionally satisfying.
> I wrote specifically about him not being at the forefront and questioning his values, as displayed by his actions during the pandemic.
You’re attacking his actions and not his recommendations. Ad hominem.