Why is this OK?

So today at lunch I found out one of my male students called a female teacher 'sexy chocolate' during our mentorship class. Needless to say I didn't take that news real well and seriously chewed his ass out when I saw him before class. I told him that if I caught or heard him doing something like that again I would call his grand parents, write him up for sexually harassing a teacher and personally walk him to the dean's office. I also made him go back to that teacher and personally apologize to her for that comment. WTF?

Why is this OK? It's not the first time I've heard female teachers get hit on at school. Last year one kid told his teacher that they needed to get together because he could 'teach her things'. Are their home lives so bad that this is an acceptable behavior? Do the parents have so little control that they let their sons do this at home? My parents would have ended my life if I had done this in high school and not figuratively either.

Tomorrow I am going to address this issue tomorrow with all my classes to let them know that they need to add this to the list of 'things you just don't do'. What's sad is that I even have to do it at all.