I absolutely hate it when I come across such acts. It is not always a case of insufficient litter bins around. You can have a bin within meters but the inconsiderate users would just refuse to dump their rubbish in them.
I have seen adults who left their beer bottles behind and I have seen teenagers who left the McDonald's boxes and wrappers on tables like this. I have also seen lots of litter in cinemas after the movie ends. Their behavior is simply disgusting and I really abhor such antisocial acts in public.