I am in my early twenties, a third year student on a professional course.
I was supposed to attend a teaching session, which I missed. I won't go into the reasons, it was it was fully my fault, but it is very very unlike me (I have never missed a session before) and there was a reason behind it.
I sent a email profusely apologising to the person leading the session, and she replied saying for me to come and see her. I thought that she was being kind and was going to explain to me how I could catch up (e.g. recommending some reading or something).
When I arrived at her office she immediately started to scold me, telling me my reason wasn't good enough etc. This I can understand. But she acted like she was a teacher at primary school or something- she even called me a "naughty girl!" I was too shocked and upset to stick up for myself (I have some childhood issues so tend to cower when being "told off"). I felt small and ashamed.
I agree I was the wrong, but I don't think it's acceptable for her to treat me like a child. I realised that if I were a young man this would NEVER have happened and that really pissed me off.