It really is hard to say what the absolute worst creation of mankind is. I'll go with something that's intangible -- the idea that a person of: different nationality, race, gender, skin color, and genetics in general, etc is any less of a human than another.
You make me want to use the spork, but I'd feel bad abusing someone with one too many chromosomes such as yourself.
Weird, it told me you quoted me but I came here and there was no quote.