Mean spirited sure, ad hominem, no. It's satirizing the argument, not personal traits unrelated to the argument

It's definitely a bad argument worthy of some sort of label. It seems to go "you believe this thing, which I won't engage with at all, but I'll assume that because of the way you said it, you also believe all this other stuff that I disagree with".

The term you are looking for is straw man

No, satire would involve an attempt to pretend to make the same argument while exposing flaws. This was just a bunch of uncharitable strawmen.

I stand corrected.