I used to have a terrible fear of bees, and while I can't remember exactly when, I think it kind of just disappeared sometime between my early to middle teenage years. I even had a teacher in middle school make fun of me once because I was scared of bees, and just like that, I was out of his class. (I don't remember what the class was.)
It was a class on the upper floor, and the windows were open. I was sitting at the front when a bee flew in and kind of just hung around me. Terrified, I just got up and moved toward the back. My teacher told me to move back to the front, and I refused. I think he asked me about two more times, but I just refused. He then came up to my desk, put his face in my face, and said, "Well, I'm scared of having your face in my face." At that point I was upset and walked out and sat against the wall outside the classroom. He then tossed my things out on the floor. I think after that I just went down to the office, but I don't remember.