If I said or did something, and a colleague of mine was offended by it, I would apologize to them, even if I didn't personally feel that what I did was offensive. Intention doesn't mean anything, in this case.
I don't see why that's hard to understand.
My standards are different. I'll apologize if there is a rational basis for their perception. But to validate a feeling by its mere *existence* is a bucket with no bottom. Especially when the arbiter of validity is teenagers.
Where are you getting this stuff about teenagers?
We're speaking of colleges and thus college students. Many of whom are teenagers.
The only person quoted in the OP as being offended was a staff member of the University, not a student.