Gaav laughs not totally derisive but definitely in that tone of "You amuse me puny human." "Provided whoever is interfering will be affected by them. It's a bit annoying you know to have white magic sprinkled through the town, not enough to be trouble to me but annoying still."
I don't think I've ever watched a whole episode, it's very amusing but I don't think it was meant to be as funny as I found it? I can only imagine the legion of books written about wand-envy! :P