Sam Bowman reports that he was flying Virgin Atlantic in economy. He reclined his seat, he says, in order “to sleep and the grown man behind me started violently shaking and kicking my seat.” After the violent passenger was told to stop, “his wife loudly declared that I was a sociopath.”
The important point to make here, aside from the obvious “don’t physically shake the seat of the person in front of you” is that a passenger whose seat reclines gets to decide whether to put that seat in the upright or reclined position, outside of takeoff and landing where the government makes the decision for them. It’s not always appropriate to recline, but the decision belongs to the passenger whose seat it is.