It means that you are a very clever man making the mistake, common to very clever people, of assuming that everybody else is stupid.
"…you’re a bit over-qualified for the position…"
That time when the Doctor nearly landed himself the job of caretaker at Coal Hill School.
Remembrance of the Daleks - season 25 - 1988
"I used to have a teacher exactly like you."
”Well, you still do. Pay attention.”