One reason I just "let it go" is i ran into one of those types once. Was at a food and wine in NJ and someone cut me then didn't move because she was grabbing drinks from the bar set up there. I said excuse me a few times and was ignored so i and the rest of the line went ahead, she started screaming and poured her beer over me. She followed me as I tried to leave and the booths refused to call security. I ended up having to call 911 while in a convention to get someone to get her away from me so I could get to my room safely. So after that i do not say a word, you never know if it's going to be some crazy person who will take it too far.