I'm afraid 411A has it right.
I've watched it time and again in long(er) bodied airplanes.
Heavy weight takeoff, gusty winds...and yet, dispite discussion about this prior to the takeoff maneuver, some First Officers continue to use a rapid rotation technique...and in doing so, tailscrapes can be expected.
I have not infrequently discussed the need with copilots in conditions of strong crosswind, contaminated runways or poor visibility that the rotation
must be completely standard and at a normal rate. Then I have been startled when the wretch wrenches the thing off the runway 'in an attempt to get airborne quickly and cleanly'. It doesn't work on a large, heavy aeroplane, and seemingly, no amount of discussion gets the point through. It is only when they see a take-off rotate up close of a large heavy type that the lesson gets through some numbskulls!
It is apparent that is overwhelmingly the most likely cause here. Inexperience, lack of thought, lack of understanding.