"Well, you haven't done any of that yet."

When I was in college, I struggled with serious depression. I would get overwhelmed easily and I ended up missing a lot of class. 

I was always upfront with my professors about this at the beginning of the semester, giving them a heads up about my situation before anything happened. 

I was enrolled in a class with a professor who was very esteemed and beloved by all students and fellow professors in the department, and on the first day, I explained my situation.

His reply was, "Well, you haven't done any of that yet."

Later in the semester, I missed a very important part of his class, one that others relied on me to be there for. He called me into his office, told me that I had disappointed everyone in my class, and that I would not be welcome to attend the rest of his class for the semester. He told me that I owed it to my peers to stand up in front of them and apologize, which I did. It was the worst experience of my life, considering the state I was in.

The next year, he retired. The school put on a ceremony in his honor. I had made great progress since then, and so I attended, and I realized something. I recognize that he has made so many positive contributions to the lives of so many students for decades. I recognize his accomplishments as an educator. That doesn't mean that he is without fault, and that doesn't mean he was right. I respect his reputation, but his dismissive response to my trying to warn him about a personal issue is what stuck with me.