I'm guessing that the woman wasn't being disruptive, since PZ Myers (who never ignores a chance to bash his opponents) didn't explicitly say so--he just said that she asked a dumb question. In that case, the booing was extremely inappropriate. However, I see it as indicative of a larger phenomenon: atheists (and perhaps rationalists) developing a sort of group identity. This could very well be a bad thing because group identity often leads to groupthink and rationalization.