Glad you finally noticed...

Student: Ugh, I hate Ms. (other teacher).  She's so--
Me: Okay, that's enough, I don't want to hear you disrespect my colleagues.
Student #2: You talk to (other teacher)?
Me: I talk to ALL the teachers.
Student: Ugh, you're one of them!  We thought you were on our side, but now it's apparent that you're on their side.
Me: Huh?
Student #2: You know, you're one of the TEACHERS.