Good, and you?

I've worked in a grocery store for almost 4 years.
It is customary to say 'Hello how are you today?'

I decided I will NOT be saying that anymore.

Everyone just says 'Good, you?' And walk away. They don't wait for your response ( not that they would care )

Everyone says good. I'm not always good, but you can't be like horrible and you? haha.

It's just become insincere. When I ask people 'How are you?' I really want to know.