I can barely see how the teacher would find this mildly offensive. What's wrong with the parent obtaining more perspectives on an event? The wording of "is this

I can barely see how the teacher would find this mildly offensive. What's wrong with the parent obtaining more perspectives on an event? The wording of "is this true" is a bit odd, because its very unlikely the student would just say "no". There is almost definitely some explanation required. Hearing the student's opinion is valuable on its own, and parents don't ask to test the integrity of the teacher. Also, it has some value by making the student admit his actions.