I live with 6 people. 3 of them (apparently) have Si in their ego functions. The problem is, they are always focusing on the sensory aspects of life. What annoys me (I let me be annoyed by it) is that they seem to use it in a self destructive way. For example, they like to spend a lot of money on food, and it isn't healthy food, or they take a lot of medicine to cure health issues. Whenever I have some health issue they try to impose drugs on me, and I don't trust taking drugs unless it is the only way of surviving. They are always rigid about not messing up with the house, I can't barely walk over some rooms just because they have just cleaned it. But my main concern is why they like to waste money on food everyday and they treat it as if their happiness depends on it.
Some Si ego help me