If you did this in a pub or a shopping centre, people complained and the police decided to prosecute, you would probably be looking at Common Assault at the lowest level. A conditional discharge or a fine at most.
Ditto if you did it at a rugby or cricket match.
The law, and in particular punishment, relating to football matches is in serious need of review.
Common Assault? Are you kidding? Who was assaulted? Who was injured?
Get a grip.
Length of bans ridiculously OTT.....but that is, sadly, the way our increasingly sanitised sport is headed