It’s an emperor has no clothes moment. There was no fire. Everyone apologizing about a fire that never existed. Then someone finally points out what everyone knows already but is too afraid to say. But that only made the imaginary fire bigger.
He sure got burned for there being no fire.
To put it another way. Don't stick your nose where it doesn't belong.
He said he would be more cautious about his behavior, taking care not to socialize with students or inject himself into conversations that are “none of my business.”