We Can’t Even Sugarcoat It
This kind of behavior is unacceptable in public, no matter how you look at it. We can’t even try to excuse this guy’s behavior, throwing his trash on the floor when the restaurant is full of garbage bins. After you enjoy your coffee (although we can’t see how it would be enjoyable with so much sugar, but that’s beside the point), the decent thing to do is throw away your trash.

The coffee shop employees are there to make our coffee, serve our pastries and occasionally clean the floor and keep the place pleasant and welcoming, but they’re not our personal maids. It’s common courtesy to clean up a mess you’ve made and pay some respect to the employees and the place.