Assigning some reason to anything someone wants to say is the most common conversation pattern I consistently see. It's not specific to coffee. People may be cr

Assigning some reason to anything someone wants to say is the most common conversation pattern I consistently see. It's not specific to coffee. People may be cranky, but the excuse that it's because they haven't had their coffee yet is an ad-hoc justification. If you handed them a coffee to drink in that moment, they would just have another excuse. It's the same conversation pattern that people follow when they say: "I think X, because Y". You then go and show they that Y isn't true. They come back with "Ok, but I still don't like X". Y was never relevant.