You're responsible for yourself
If you want to use your loyalty points, you have to tell me that. I'm not paid enough to pretend to have telepathy. If you wait until the transaction is over to even ask about your points, then get mad I didn't ask about YOUR meager fucking points, and make me redo the entire transaction to get your dollar, you're worse than a toddler. I was asking for what I wanted before the age of 5. I don't care about your points. That's your responsibility.
Don't worry though, I'll follow you home to wipe your ass for you too, I know that's too much to remember