Well I have been in a few aborted takeoffs, albeit on the flight deck with shoulder harness fastened and also a couple, sitting in the cabin with lapstrap fastened. I have never experienced any forces that would have thrown me into the back of the seat. An aborted takeoff is nothing like the sudden stop of back ending another car where you get a rebound. The worst one ever I experienced when we had an uncontained failure of No3 engine at the call of V1 at about 145 knots at Haneda Japan. Admittedly it happened a long time ago but I can not recall any passenger panic or sensational journalism in the aftermath. Maybe Japanese passengers are more stoic and their reporters a bit more switched on?