This is one of the reasons I don't go to Bills games. I hope the perpetrator is identified and apologizes.
https://www.whec.com/top-news/i-was-scared-8-year-old-49ers-fan-and-cancer-survivor-speaks-out-after-being-pushed-by-bills-fan-at-game/
There is something about this story that strikes me as less than Kosher.