When I use the toilet, I am not obligated to leave the seat up or down on the speculation about the preferences of the person who might use it next.
If the microwave oven is not suitably clean when you want to warm your food in it, you are welcome to bring it in compliance to your personal standards. While I will not leave a mess, I cannot be held to your standards, especially when you will not be held to mine.
When my first wife was alive, she used to bitch “You left the toilet seat up!” continuoslly. Before I married my second wife, I bitched at HER,”You didn’t leave the toilet seat up!”. so I dribbled on it just to make a point. It worked.