Just caught this before going off line for the evening and thought Id add my comments for your enjoyment!!
We had some training at my place of work tonight. One thing that was said by the trainer was that when going into a cafe to purchase coffee, you have to remind yourself that it is not your shop and that the people behind the machine will have different tastes and ways of making coffee.
That said, I still believe that the customer is in the right if they are not happy with their product (and as for charging you again for that coffee, especially after you sending it back, what a rip off! >:( ) and you should be able to get what you think you should be paying for.
I nearly died the other day, when my boss came up to me and said, "Can you make me four caps on instant coffee?" I just stared at her and said "Youre joking, right?!?" Her shake of her head made me see she was serious. The customers then afterwards said that their coffee wasnt hot enough. Okay, so I frothed their milk to the limit of 70 degrees and even I have trouble drinking it after that temp. So what do you do?? Well, I think you bite your tongue but say that youll try to do better next time. Let them drink burnt milk if thats how they like it.
So, my point being, as the maker of the coffee, I would try to make it to my customers tastes. Especially if they specifically ask for it in a certain way, I will do my best. Even then I would say to them, if its not to your liking, please let me know. But then, I consider myself to be in a service industry. Of course, you have to remember that not everyone else thinks so... ;)
Oh and for the record, el espressio, I dont think you are fussy. :)