I can't believe the comments here. Even if the kid was rude on the message he left, he's 17. This woman is a adult and she never should have said the things she did in her message. I would suggest she needs some sort of counseling.

When I was in high school (10 years ago or so) we (my classmates and I) disputed a new dress code. I called the school administrator and principal at their homes to discuss this matter and they were happy to talk to me about it. I see no problem with calling people at home to discuss school matters.

At any rate, this woman was 100% wrong to retaliate the way that she did!