If he posted the video to expose a group of racist fans then all credit to him. However, I could be wrong, but I suspect that the idiot who posted it thought it was hilarious bantz.
A bit like the Charlton fan who filmed his mate chucking his seat towards the Millwall fans and publishing it...
Can't be that hard to work out who they are. I'd start with the idiot who thought it a good idea to take and publish the video.
https://www.youtube.com/watch?v=nksnXeIikC4