I can definitely relate to what you are feeling. I appear to respond the same way. Not often, but every now and then something will just hit perfect to make me feel so strong about not wanting to have anything to do with that someone anymore and the sad thing is.. once I feel that way, it's almost impossible for me to turn it around. It just happens without any effort really.

So... having said that, I would suggest what ham-bam said. Loosely try to educate him with some materials. In the meantime, see if you can get past your feelings. If not, try not to be too disappointed as this person may have been counterproductive to you anyway.