I sometimes run the tap after going to the bathroom to make people think that I washed my hands
What makes you want to pretend to wash your hands?
I don't feel like doing it.
While it can feel like a real chore to wash your hands, it is for a good reason. You'll be considered unsanitary by others if you don't.
I'm too lazy to wash my hands. Too much of work.
You could catch diseases by not washing your hands, or you could spread your diseases to others. Washing them after going to the bathroom is considered the right thing to do.