I agree that we have some idiot as fans. But I think the reaction on here is OTT. I don't agree with the 'poor old man' argument. Wenger has been in the game for years and probably seen worse. He's probably more surprised about by the fact that it was our own fans booing. That's even if he noticed they were Arsenal fans.
He'll be fine and has probably dealt with more intimidating situations. He'll bat it off with a smile.