Of course, an ad hominem uttered to avoid can always be backtracked on due to it being a matter of avoidance rather than explicit rebuttal
And the only way to tell would be to read minds.
Because the post itself is not an ad hominem argument.
If you close one argument because of the personal attack then you have created another argument, and it is that argument would be the argument ad hominem.
And if you don't, as in this case, you have not created an ad hominem argument.
(You have now checked both boxes in my off-the-cuff illustration of wingnut posting on this and several other matters of basic literacy: the "why" and the "if" examples).
Unfortunately the reasons for doing so can still be an ad hominem,
Sure - that is, once mentally corrected for rightwing syntax collapse
("reasons" are never "an ad hominem". Arguments can be. You seem to do better when you don't shorthand - you had a streak of correct usage going).
But in this case no such reasons were visible, as one can see by reading the post, and when claimed by mindreading they were denied by the poster. So no ad hominem argument was present.
But be that as it may, feel free to move on.
It's going to be difficult to discuss why people post ad hominem arguments without some kind of basic agreement about what they are in the first place.
For example: Apparently - according to some here - I am entitled to claim that anyone who has me on ignore is committing the fallacy of argumentum ad hominem, in whatever thread we both appear. It seems that all I have to do to justify that is assign them the appropriate motive or "reasons".
Post 140 adds nothing to the issue, other than your preference for separating out the issue of whether to deal with someone at all or not. Unfortunately the reasons for doing so can still be an ad hominem, whether you want to accept that or not.
So the question of why they do that would be relevant in this thread?
Seems implausible, and quite confused.
Meanwhile, the ability to separate out the practical issue of dealing with a bad faith poster without addressing their "points" or arguments -
that is: regardless of the "worth" of the "points" they may have "raised" -
- especially a bullshitter, who will inevitably make what read as worthy points amid the spew -
is a basic necessity around here and in most public discussion arenas these days.