I will be hiding names to hide the identity of me and others.

So my classmate, Bob, a nice kid, gets pulled out of class. He didn't know why until he saw Mr. Summer, holding a notebook. On the note book were the words written "Garfunkel likes to watch gay porn with her father" (NOTE: Bob did not write that, and the teacher dislikes Bob) Bob got punished with a detention all because the teacher "knew it was him because of the use of words" Bob finds that offensive that the teacher would relate that to him. Also almost everyone in the school system hates him for no reason besides his brother was a prick) What do?