I once said infront of 30 people that a benefit to being bald is that you could pretend you have cancer

This happened when I was about 13 years old walking back to school from a PE (gym) lesson which we did outside of school in a sports building. For some reason me and a group of 4 other odd 13 year olds randomly decided to talk about if being bald would be good or not (don't ask what lead up to it). So they were saying some random = funny benefits like "being reflective" or whatever until I decided to chip into the conversation. As the group of 30 students were leaving the building I blurted out quote "you could easily pretend you have cancer". Little did I know the teacher was standing right infornt of me (coincidentally he was bald). He dragged we to the side and told me off infront of everyone why what I said was wrong. Its been years and I haven't lived it down since.