James Kilpatrick could be pretty caustic, though I don't think he ever used the "a" word. And the Dan Aykroyd/Jane Curtin parody of Point/Counterpoint on SNL was all insults. I seem to recall "Jane, you ignorant slut..."
Yes, that was a great line, but SNL fancies itself a comedy show (pause here for unintentional ironic laugh), where obviously the whole crew is in on the gag, not a political talk station where there were strongly held views about very important talk subjects like war and the safety of Americans in a post 9/11 world. The debate was good, could have been great, but Zig blew it by not being professional. It's his lack of professionalism that explains his career, not his lack of popularity. I seem to remember his show had pretty good ratings back in the day.