My worst was meeting a guy from online at a corner in downtown SF. When I first saw him I thought, I don't know if this is my type of guy, you know that gut feeling but I was there and had agreed to meet. We walked a few blocks and stopped for a beer. I paid for the first. We sat and talked for a bit and somehow the subject of religion came up. He made the comment "I hate Christians" and followed it up by "I hate ALL Christians". Well, this was interesting, since I am a Christian and we talked a little about it in a very non-confrontational manner. We also talked about other things and then I excused myself to hit the head. When I returned, he was gone. Table was cleared, my beer (half drank) was gone. First time I had ever been stood up while actually ON the date.
I had issues after that going the restroom while on a date! What a loser he was!
Oh and then after texting him with no response, I was eating dinner when he text me to say, again, "I hate all Christians", to which I kindly replied how inconsiderate it was to have just left while I was in the restroom and then ended it with "God Bless".