Why can't the horsehead face the bathroom door?

From the perspective of geomantic omen, the forward direction of the horse represents the master's future, and the toilet is dirty, so you can't point it at it, just like many people, for example, it's best not to see people when you enter the door. Why do you make a screen when you enter the door, especially in Chinese style? You are afraid of bringing foul air and flushing air to your home, changing shoes, convenience and so on. China pays much attention to geomantic omen.