Whack job is a little harsh IMO. He definitely has a developmental deficiency which I don't find funny. I do however find his over emphasizing hilarious. Sure it's quite possibly a result of his disability, but comedians play the part all the time and most everyone laugh, which is worse.
I applaud him for his zeal. I wouldn't miss the weather report if he was on daily.
I'm also not a fan of high horses
.