It's how humans rationalize their view of their own "development" and "progression": 1. I liked to do an activity before. 2. I don't do that activity any more

It's how humans rationalize their view of their own "development" and "progression": 1. I liked to do an activity before. 2. I don't do that activity any more, nor like it. 3. I am older, so I must be wiser (or else I wasted my time) 4. Therefore the old activity was bullshit all along. All hail my personal development.