Bad sign from the get-go
While the plane was still on the runway, nothing seemed too out of the ordinary with this person’s seatmate. However, as soon as the plane went airborne, the person whipped their shoes and socks off, took out a nail clipper, and began clipping their crusty toenails. It just goes to show that even the most ordinary-looking people can be deeply disturbed.
We hope for the OP’s sake that the notorious nail-clipping passenger collected the clipping, but that might not be the case. After all, if you’re self-centered enough not to care about others while you clip your nails, why should you care about making life easier on the flight attendants?