Rangers seem to get away with most things in Scotland mainly as most of the officials lean towards Rangers. Celtic fans get called panarnoid for suggesting this however it is only when Rangers play abroad where the officials are neutral that they get into trouble for nazi salutes, anti catholic, pro white up to necks in fenian blood comments.
Funny that Rangers fans have drawn up allegencies with the Loyalist Linfield fans and the Chelsea head hunters both known for their sectarian bigotted views.
I admit every team has a minority (including Celtic) but with Rangers as they have proven throughout their history it is closer to a majority but the SFA turn a blind eye.