What would you do?

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A teacher sends home a note that states "Your son is going against her authority, because he is correcting her knowledge." She says, "Johnny is getting other students to follow in tow, too." The way the teacher says it, is..."The problem is that little Johnny is challenging my 'professional' knowledge, and as such...my authority." You see, little Johnny told her she's wrong about something that she taught in class, and he's doing it in front of everyone. Therefore, the teacher sent home a notice that little Johnny is to receive a detention, due to his actions. She has spoken to Johnny about this, previously, she says. Johnny says, "She's lying to the class, because she's not giving them the correct information." To a child (age 8,) this can be perceived as lying, I'm sure. However, the problem is, Johnny is correct about the subject matter. The teacher is instructing the class, incorrectly. He has not challenged her 'in front' of the class, except to say, that "she's wrong." As a parent, how would you respond?