Going by his series of tweets, it wasn't a mistake. It was deliberately a low blow which is really the only problem I have with it. Everyone's got something wrong with them, either in their head or on the outside, and it's just a dick thing to do to go for that kind of a little jab at the person criticizing you when it has nothing to do with what they said.
I doubt they'd care what he has to say, so why not take them down a peg with a quick jab and playing it cool as they foam from the mouth because he won't play pretend with them? Since they always include Bible passages with their life lessons on Veggie Tales:
Give not that which is holy unto the dogs, neither cast ye your pearls before swine, lest they trample them under their feet, and turn again and rend you. (Matthew 7:6)
