We're currently on holiday in France in a rented villa. Contract says all breakages must be paid for. Owners are holding a hefty deposit of our money. First day of the holiday, my dh lay on the sun lounger. As he got off it, the stitching tore so the bit you lie on isn't properly attached to the frame. My dh is normal size and didn't do any weird manoevering when he got up. He just lay on it, then got off it i.e used it completely normally. Its not a new lounger and I suspect was on the point of breaking due to normal wear and tear. I think whoever had lain on it next would have broken it.
I suspect the cost of a new lounger will be taken from our deposit. Aibu in thinking this is not OK.