That is not a fake smile - it is a real smile that has a meaning - that is a smile that means i don't really want to be here... [and maybe - but I am trying to make the best of it to be polite to you ] nothing fake about it unless you have only one interpretation of what a smile is supposed to mean..
You know, if you don't recognize that there are different ways of communicating in different cultures, you are probably not going to get it...