The law applies to the abusive chanting, gypos etc, standing in a seated area breaks a club rule. As for why they did nothing, I don't know, I wasn't there.
The club are not going to get fined for a handfull of people standing up at the back row, your kidding yourself if you think they will. It happens at every ground and at Scotland games the whole stand stands during the game. There wouldn't be a problem if there was some common sense showed by the club and stewards. The same goes for 'abusive chanting' and saying the word gypsy. If you think the ICT fans are abusive then you really don't have a clue about football on the whole.