EXACTLY what I came here to say.
Season Opener in Arrowhead in 2011, I had a similar altercation. We were walking to our seats (last time we EVER sat in the cheap seats, btw), and we were wearing Bills gear, a dorky twig of a Chiefs fan wouldn't allow us to pass through, I asked if he was serious, and he would NOT move, I laughed and said ok, I'll just step down a level and walk around your ass, so I step down to walk around and he slaps the back of my head, like WTF?! I grab him by the jersey and yank him down into the row beneath me. Guy is yelling like a little B word, screaming that I assaulted him. I keep walking and laughing. The crowd hysterically laughs and I get a few hi-5's from Chiefs fans on the way to our seats. The guy ended up leaving about 10 minutes later when everyone continually laughed at him. Idiots.