It gets really frustrating when you start walking away and the opponent says: 'Oh yeah, walk away. chicken ?' lol.. If I were that guy from Back-To-The-Future, I'd bash him up.
"Only you would know if you tried or not. The thing is, even if you did, the fact is you still lost".
Usually when stuffs like this happens, I tend to avoid saying more than 1 sentence because they might walk off before i get a chance to make my point. So I alway try to make it real and simple. Player A: I'm not even trying. Me: Huh???? Player A: I said I'm n............ Me (yell): NEXT!!! then walk away