Fellow atheists, what's the most offensive thing you've seen another atheist do?

For me it's got to be seeing atheist alliance international give their richard dawkins award to bill maher who's neither an atheist or a true promoter of science with his anti-pharma stuff. Even worse, Dawkins supported the decision even after being informed of Maher's anti-science stance in regards to medicine, a position that Dawkins himself has condemned in his lectures.