Pff, Superman? Excuse you, but this guy's got glasses. He can't be Superman!

For your information, it's a canoe full of douche. The used variety. That's why it's not a good thing to be called. I don't get why people use 'douche' on its own as an insult. There's nothing, like, inherently gross about a box or a bottle of the stuff. But anyway. There you have it. The science of insult.