Again. You think someone should be able to figure it out with the tiniest effort. But it really may not be so obvious to someone who doesn’t know what you know.

You are not alone here - all people struggle to truly visualize the mind of another person who doesn’t know what they themselves know. Sure you know whatever it is 1000 times over. But the customer does not, and they may have a totally different 1000 things in their mind.

People don’t want to take a guess when they can just ask. If you are in an area where customers can address you, you are there to help them. Why should they stop and guess to spare you effort? It is unreasonable to get pissed off by this.