Maybe it is just because I have never witnessed it, but in all my years reading these kinds of debates I have never seen an atheist, agnostic, or evolutionist run away stating something to the effect of, "You are all too stupid and this isn't worth it."
On the other hand, I've seen countless theists/creationist use this tactic. Maybe I just haven't been in the right place at the right time, though. Has anybody ever seen a non-theist/creationist do this?
JustinC