well put, especially for online discussions. There is even less to gain here by questioning someone motives and putting people down, so we will be better served by responding to the logic.
That said, ad hominems got a bad name, especially in modernity, as so many people conduct baseless attacks on their opponents in the “free speech”/”everything goes” environment.
How do Jews deal with it? On one hand, we generally avoid ad hominems against Talmidei Chachomim – a lot of Gemorah discussions are based on someone reporting what he heard from his teacher’s teacher – and integrity of that is not questioned. On the other hand, we clearly check integrity of a witness, and discard his opinion when he is shown to be not kosher – especially
if his behave is trief in the area that is being discussed.
an example of inappropriate ad hominem – R Yohanan commenting on Resh Lakish’ knowledge of sword making. examples of inappropriate ad hominems – discussions (Avraham, Moshe) with Hashem, insisting that He should do according to what He promised.