Coaches do so much research about a referee because they believe refereeing is such a crucial part of the game that the result may hinge on what we say or do. They probably know more about me than I know myself!
Coaches will do what they can but it doesn't necessarily bother me. You are an international referee for a reason. If things like that are going to ruffle your feathers, don't bother doing the job.
One rule that will work if it is used everywhere, is that when you have a free-kick, the referee puts the mark on the floor to make sure the defenders keep their distance.