It's a little known fact that anytime a barista says "have a nice day" it really means "I want to get into your pants". You should go back and ask him out, but make sure your best friend is there to record it and post it on YouTube. Yknow so you can see the magic whenever you want 👍
Overthinking it. I'm taking it you think of him as "man candy"?
No he means this: "Have a nice day, but only with me. I want you to slowly turn around with your coffee and sensually sip your coffee while making eye contact with the creepy guy in the corner who never seems to want to leave the store. Then slowly walk out the door, hips swaying, and tell me what you want me to do to your body. Drop your keys and bend over to pick them up, but take your time with it. Walk back to me and passionately make out while I brew you another cup."
Lol you're overthinking it. It's something they are trained to say or just say in a polite manner towards there customers after purchasing something. That goes with sayin "Have a nice morning/Have a nice night?" etc