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.
On one hand, youre welcome to do whatever you must to get through the day. As i mentioned above, I dont want to be a dick about it.
That said, the convention has always been to say, “have a good <time of day>”.
I hear that you dont want to invest the effort to compute the time of day, and thats kinda what I hear when some one says “have a good rest of your day”.