Originally Posted by Hang on Fi
Unlike most, many people will use a black stirrup in their favor to appear to have a "steadier" leg/foot than they really do. IMO. Per usual, it's no surprise. Only takes a few to use it negatively and ruins it for the rest of us :P
No one used it negatively and ruined it for you.
Simply, a black stirrup makes it hard for a judge to see if a rider lost their stirrup. Because of that, black stirrups are no longer allowed in Equitation classes.