Now, this is super-highly offensive to Thais, but the comments do seem a little over the top. The man depicted in the movie is the king of Thailand, and he's regarded pretty much as a demigod. I hope somebody sets the US embassy on fire over this, that'd be hilarious.
Youtube is blocked here in Thailand now because of this. Don't see that changing for a while.
Ah, freedom of speech, it's not for everyone.