Did you perform a detailed study including decibel measurements to arrive at this conclusion. There's evidence on this very thread that I'm correct. Read the quoted tweets from bigots. Yasser now we can sing the famine song and Billy boys for the full 90 minutes was one, meaning due to obfa he felt he couldn't. You're going to have to supply some evidence for your view.
And being seen to do something is great, as it sends the message to these people this is not acceptable anymore. Now the message has been sent that it is. And I guarantee you bigoted singing at old firm games and all the negative associated societal effects home and away increases now. Scottish society has been gleefully damaged by the unionist parties just to damage the SNP. Plus 80% of the public support it, and the job of elected representatives is to represent the views of their constituents, hence the name.