Why do people always feel like they are wasting time? How exactly do you waste your time? I ask people this every time I am told, by them, I am wasting my time

Why do people always feel like they are wasting time? How exactly do you waste your time? I ask people this every time I am told, by them, I am wasting my time playing games on my computer. I love playing games... why is doing something you love wasting time?