I think the internet has had a part to play. In the early 90s, the referees could largely avoid the malevolent, combined forces of yahoo vicTimhood and inTimidation outside of football grounds (other than the odd window smashing incident).
Nowadays, they're like a plague of locusts, swarming all over anything they don't like. You just need to look at any Rangers related article to see evidence of this.
One would hope Rangers are or have put together a dossier with statistics and specific incidents to hand to the SFA. Having said that, I wouldn't expect much of a useful response, so what's the point!?
It's a bit depressing but I think we're stuck with it for the time being.