So what you're confirming is that despite a perfect game, there will still be reasons to abuse the referee.
So increased competency makes little difference to the overall problem, does it? Because competency of a referee has no impact on the emotional regulation of the individual in the stands, which is the actual problem.
Can you see the conundrum in effect? When you have two competitive teams playing and one loses, then the competence of the referee is inconsequential and makes no difference to the end outcome which is always the same, I.e blame the referee
Call it the 90 minute toddler effect, when fans don't get what they want they look for the easiest source of blame to mask their frustration, mirroring a small child