Absolutely this.
I don't think the referees are consciously bias. I think they're shit scared of all the flak that comes with it afterwards. It must be a nightmare seeing your name in the paper, hearing it on the radio questioning how good you are at your job because you've made a mistake.
I couldn't tell you who the ref was that made the mistake last night but you certainly know who it was when it is a decision that goes against either of the Old Firm.
In regards to the overall quality of referees, I thought the ref for the Aberdeen v Livi game on Tuesday was awful. Almost every 50/50 decision for throw ins went in our favour when you could see from a mile away that it was a Livi throw. You then have the other extreme of Lewis Ferguson collecting a booking for being second to the ball for a header. It was absolutely a foul but never a yellow. It was nowhere near as bad as the 'challenge' on GMS in the league cup final a few years ago and there was no mention that we should have had a pen there. Lewis then made a late challenge later in to the game where he was lucky to escape a second booking and the referee didn't bother to have a word with him.
Aye. Seen this levelled at you a few times when you've been very honest and opinion about your support for independence.