My original post here was very general, because with so many people reading this thread, I wanted to get that info out there. Maybe it could help someone.
As someone who is probably old enough to be the mom of some of the current students in pharmacy school right now, let me say this (and I know it will be unpopular, but mom-hat is on)...
Not only are you going to have tests in school, LIFE is going to test you. Sometimes, the test isn't about You (how good you are, or how well you did). Sometimes, it's how you handle a situation. Taking ownership of how a situation was handled on both sides is part of being an adult and being a professional. Not saying that another person can't be at fault - of course they can.
There is a whole generation that grew up in the "everyone gets a trophy; it isn't your fault, it's the teacher's fault" environment.
Life doesn't hand you a participation trophy and say Good Job! As the student, it is your job to learn what you can in the time you have. Some of the things you have to learn about yourself or about the world might not be the lessons you thought you were signing up for. Those of us who have been around that block a few times know that some lessons taste pretty bitter. There will always someone in life you feel has slighted you or wronged you.. How you pick yourself up and move on is what shows your true character.
Adulting is tough. In this case, the OP had one bad Preceptor... The class was made up and it's done and over. I'm still not quite sure of your original point of this thread other than needing to vent and hoping that everyone would side with you and tell you how you were wronged.
What could YOU have done differently? What did you learn so you know what to do when you come across the next Preceptor, or Boss, or Manager later that you feel treated you poorly? How much of it is really them and how much of it is really you?
If something was truly in the wrong and 100% not on you, then that is something the school will have to handle. But beware of how that makes you look, too.
Personally, I would have approached the Preceptor to ask what I could have done differently and what specifically they took issue with so that I could work on it, and I would have said it in the nicest way possible to be non-confrontational. The reason for that is because you want the feedback. You don't want the person to be on the defensive, or to be antagonized so that they come back swinging. You need that feedback so that you can honestly evaluate it and decide how to approach your next situation / experience.
Sorry, mom-hat is off now.