On properly looking at the bill, it is designed to target sectarianism, but it also encompasses a lot of other things.
For example, someone singing the nasty 'Mark McGhee' song could well be prosecuted under this, and in a court, even in public, I'm sure it would be judged to be as pretty offensive, while on the terraces, it can be funny. Similar with shouting about a player's maw being a dog, certain fans being inbred mongos and such - these seem to fall well within the 'criminal' bracket.