this happened with our ds11; for him it was surprising because the teacher had been asking them to use their own 'voice' while writing, and he is working on his funky, in-your-face self...so that's his voice. Well, it didn't go over so hot, in fact he got pulled into the vice principal's office even though he didn't use any words like 'sucks' or anything like that.
Kind of contradictory, kind of over the top silliness on the part of the teacher and principal, when you are looking at a kid who hasn't been in trouble for 6 years of school, ever. I wondered how a 40 year old professional teacher could actually be offended by an 11 year old stretching his voice a bit. Lame.