Berry decides to treat herself to a mares' night out in Manehattan. Or maybe it's more of a singular mare's night out, considering her utter lack of friends. As it turns out, a lot of ponies from Ponyville are stuck-up assholes who don't want to go anywhere with her, considering her track record of attracting police and fights wherever she goes. Maybe the mares living in Manehatten are less anal than those Ponyville broads.
Spoiler Alert: They aren't.
Except for one.