I don't like to be snippish, so many of the more explicit derogatory put-downs listed are just too mean-spirited for me. Buttons work best with a minimum of words; succinct witisms catch the eye long enough for the meaning to get through. Too many words, and the button becomes a blurred shape rather than a sharp slogan. I also don't like the old SF-con Badge-A-Minit style handwritten slogan on construction paper, which is why I'm doing these on the computer in color.
We'll see how well these will go over.