To be fair, having just watched Stereo Kicks performance, I can understand why he's in a mood. If I knew that was coming and I'd have to find something nice to say about it, I'd have been grumpy as hell as well.
Hopefully, now that the Human Centipede is out of the way, he'll lighten up a bit. fatherhood does seem to have mellowed him...his persona has been more 'cheeky chap' than anything else this year.