Arguing with ignorance is like playing chess with a pigeon. You could be the world’s best chess player, but the pigeon is still going to knock all the pieces over, shit on the board, and dance around triumphantly.
I don’t know how true this is of ignorance in general, but it’s certainly a fair description of arguing with proud, willful, immovable ignorance.
voxcorvegis 
Thanks for a laugh – I love that quote – I think I am going to have to print it out and post it in my cube at work.