I had an interesting situation this past term. I am in my early 30s, and had a student who is in his 50s. One day, as I was trying to finish my lecture and class discussion, this student and another were unfocused and loudly packing up their belongings (in a class of 5 people). I stopped and just said "Where are we going guys?" in a normal (not angry) tone. This basically prompted an angry, agressive response from my older student - "What, I can't pack up my computer?". After I explained that of course he could pack up, but I was trying to finish class and that both students were being a bit loud and weren't focused. The exchange ended with him yelling at me, finger pointed, saying "You need to calm your attitude down!". I was rattled by the experience, and after class I went and spoke to the administration about it. They were surprised, and the best answer we could arrive at was that he was uncomfortable as a person in his 50s being reprimanded (no matter how politely) by a younger professor. Looking back, I'm not sure what I could've done differently. I was polite to him, I was clear about what I was asking, and I wasn't trying to embarrass him. The students needed to be asked to quiet down right then because they truly were disrupting the class with the noise, so I don't feel that I could've waited until after class to talk to him. Still a bit perplexed.