Is it OK for teachers to vent about students on social media?

A teacher was recently disciplined for leaving notes and then venting on social media about some of her students. But is it OK to feel this way about students? Or should people who feel that way not be teachers? Also, a first peek inside the Clarksville mayor's race, downtown is getting a new entertainment venue plus two new restaurants, and Chris and Ryan come to blows over the sorry state of rock music.