AA serve light snacks on flights 2.5hrs and under (according to their website). I also see no evidence of a drink being spilled.
He is clearly watching his phone, which is on the tray.
The lady said she has a ongoing back issue, which is why she wanted to recline, and his actions caused it to become worse, which would explain the xrays and headaches. I dunno, she may be lying, but why are we so quick to accuse her and not him?
If he didn't want to be restricted in a small space, perhaps he should have booked in earlier or I dunno, that MN favorite of paying for a better seat? At the bulk head, perhaps?
Just because he asked her to no recline her seat, doesn't mean she has to abide by his wishes. She is allowed to recline her seat, he should have dealt with it, not antagonized the situation. That would certainly not make me put my chair upright.