The people around him are childish enough to spread such
rumours. In the first place, your friend is there to study, so why
is he bothered enough to get a lecturer to solve such a trivial
matter?
Such things are usually settled without the help of a lecturer, if
a lecturer has to be called in, it's usually a serious case.
There must be reasons why his classmates are hostile towards him.
Everything happens for a reason,