Awkward Teacher Moment

I go to a boarding school and the students and teachers are pretty close. I was standing in chapel and my friend's step Dad who works at the school start picking something off my headband. I thought he was actually picking something off and I was a little self conscious but I knew he only wanted to help. But then he pull my headband down a little. Then I knew he was teasing me, which he often does... in a caring way. But that was UN CALLED FOR! He knows about my hair pulling. Gosh, practically the entire school does. So then I say "stop" quite loudly. Pull away. I think he knew I was really upset. Another teacher was staring at me. I got a bit upset and almost cried. But JEEZ WHY WOULD YOU DO THAT! I was humiliated.