Actually, it is definitely inappropriate for teachers to carry
themselves in such a manner.
What the whistle-blower did was simply to accelerate the end-result
for the teacher couldn't possibly hope to continue without getting
caught.
However, the blower could have done it WITHOUT spreading the word
and should have instead taken the information to the principal
directly. A simple print screen
The girl at the center of unwarrented attention doesn't need
destructive gossip while schooling for the 'A's, especially from
people she once considered 'friends'.