An example of insult backfire that doesn't seem to be in the "Western Animation" list would be from a Sonic the Hedgehog cartoon named Sat AM; in the episode Super Sonic, after Bunnie tries to free Sally but instead gets shot with some sort of paralyzing ray by one of Robotnik's robots.

Sally: You are a miserable creep, Robotnik.

Robotnik: Why thank you, princess.

EDIT: I think I may as well go ahead and add it.

Cut this:

* A Jewish student tried to guilt a Jewish professor on his statements about the Israeli-Palestine situation. What follows in this video is one of the most severe political ownings caught on video.

Because it's neither an insult nor a backfire. Trying to appeal to someone's sense of remorse does not constitute an insult, and having that person react by denying any feeling of remorse does not constitute a backfire. Calling Finkelstein a liar and having respond by saying 'thank you' would be an Insult Backfire.

Daft punk, anyone?