Water usage is probably my biggest. Living in a high desert, my wife and MIL see no problem with filling one side of the sink with hot soapy water to wash a few dishes because “that’s just how I’ve always done it”, to watering the grass and plants for hours. All of this makes me mental.
I think it makes total sense from their POV if I’m not posting my shit publicly and they want to be able to view it in the future. I will gladly make a copy of their photos of the trip for my own record, but I will store it in a way that only I have access.