Needs more detail but if it was a 'line of slow moving cars' all following one another with nobody wanting to overtake the leading car I'd have thought the wiser option would be to wait for a clear straight and clear the lot of them in one go rather than diving in and out of the line having to slow down every time you ducked in behind the next car. If instead the line was being held up by the one slow car at the front, then I'd personally have waited for each car ahead to overtake in turn rather than blasted past the lot of them, several of whom may themselves have been waiting to overtake.
Maybe he deemed you to have pulled in too close in front of him? If you were overtaking a line of cars, perhaps the driver who took issue with you felt that he had a safe following distance to the car in front until you overtook him and filled it? I don't know the circumstances but personally I would generally not be overly pleased if someone overtook me on a RH bend unless there was absolutely nothing on the inside of the bend to obstruct the view along the road and I was driving unnecessarily slowly.
Still I doubt he'd report it- it's the sort of stuff that happens all the time, unless there was a collision I doubt there'd be anyone sufficiently interested to report it to.