My advice for your next job: Don't take anything personally. Recognize that its is a stressful environment for a new grad, even with a preceptor whose methods are questionable. Address personality and conduct conflicts in a professional manner privately the first time they happen.
I had one preceptor early in my orientation who had a shrill voice when she corrected me, and she often did it in front of my coworkers (never in front of patients, though). I didn't take it personally, but because I was so hard on myself in combo with her shrill voice and choice of place for correction, I often went home down in the dumps. One time, I just bawled for five minutes one my sofa because I needed to let the stress out.
The CONTENT of her criticisms was right on, though, so I could never really fault her, so I never felt the need to address it with her. In fact, I heard through the grapevine that people were questioning my friendliness because I had a "mean" look on my face all the time. That same preceptor (I heard) defended me to everyone saying, "She is nice, but she takes her job seriously. Give her time to get comfortable."
Over time, that "mean" look has left my face (for the most part!), and questions about my friendliness are no longer an issue.
Possibly, my experience and the intentions of my preceptor don't match your experience. However, I hope you can take my experience into account when you start a new job. Good luck to you!