Likely your scent (whether it's after shave, eau de toilette, deodorant or soap) is why the bee is so discerning with your coffee cup.
On the orchard where I used to work, 50 or so beehives were brought in each flowering season to pollinate the blossom. Generally, the bees were OK, but if they started to swarm around the hive and you were nearby, watch out! I got stung five times around the back of my head and neck and spent the next day at home in bed.
If I recall rightly, the pattern the bees dance back at the hive after a gathering flight indicates to the other bees where the flowers and pollen are located.