It was always going to be a fixture that brought flashpoints at Pittodrie last night. Rangers heading to Aberdeen is always a powderkeg anyway given the rivalry between the sides and the reception usually afforded by the locals. With what was at stake in terms of trying to stay in touch with them in the table, that certainly added to it. John Beaton was the man in the middle and he had plenty to deal with on the night. There was a controversial penalty awarded against John Souttar, among other big calls, and pundits have been having their say on them all. READ MORE: Rangers star who exemplifie…