So Maroon,
What did you fail for? You have yet to told us.
You indicated it had to do something with taxying?
I know many reasons, and valid that people fail for,
Not getting the weather, not picking up airport diagram and looking at it before you move the plane.
That last one is probably the biggest reason people fail on taxi, they are so used to C-A-A1-10R they know it by heart, but the checkride is on commercial level etc. Some people taxi to fast, some use wrong lights etc...
So why in your mind did you not deserve to fail? Don't tell me that it was because he failed everyone else. He had to fail you on a specific reason.