Quilt shows are very much like dog shows (of which I have more than ample experience) in that they are subjective.
Each judge has their own interpretation of what a quilt should be. The judge should take into account the category entered as well as technical knowledge of all aspects of quilting. Additionally, because they are human, each judge is also going to have their individuality they will bring to the judging table.
Their individual likes and dislikes are probably based on their own experience quilting and having their own quilts judged. If they executed perfectly mitered bias binding, they will likely expect the same from you. If they consistently had difficultly with clean edges to their small appliqué yet find a quilt that excelled in this area, they might give that quilt more credence than others.
The same happens in dog shows and as a former educator of future judges I began each seminar by reminding the judges that they ARE human, that we fully expect them to be individuals in their judging process and each of them was going to have specific virtues and faults etched in their psyche that they would not be able to ignore when judging dogs.
This is the very nature of subjective judging. There is no stop watch to mark, no line to measure, and no goals to count.
Applaud the nature of subjective judging because it promotes individually and creativity, but at the same time don't let the opinion of one judge change YOUR vision of perfection. It's just different than this one particular judge.