My favorite part was probably "I mean no disrespect" because my intentions are not to disrespect  any teacher  by accidentl saying their first name. It just slipped out. We teach equality in this country and though the social norm for being in the classroom is to call the teacher by Mr.*** or Mrs. ***, we should be able to call them by their first name. It is a bold statement I understand that , but you get to a level of comfortability with a teacher where you might want to just call them their first name like a friend would call a friend by their first name. What is so wrong with that?