Their opinion and it is only an opinion because it's not from a place of professionalism or insight, is from a disturbing place of Rangers hatred and not from a place of the fucking RULE BOOK !
The game's rules state that "attempts to deceive the referee by feigning injury or pretending to have been fouled (simulation)", must be sanctioned as unsporting behaviour which is misconduct punishable by a yellow card.
Boyd is the the only pundit I've heard call the bitter bigots out and explicitly say, I don't care what you say or how you interpretate it, the Rule of IFAB is XYZ