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 hate doing dishes like that anyway. I just scrub them one at a time under running water after letting them soak in whatever water can fill in. I don’t really think of the sink as a sanitary item regardless of how much you clean it. The drain is always going to be gross.