Because you can refer to a group of people who aren't all of the same gender without saying "guys and girls". You don't have to make everything an insult, you know.
I don't get what the problem is with my comment. I saw the info about the movie years ago an it seemed like it was just a movie where they talk about filth.
In reality though, I respect your opinion even if it's wrong ;)
*honest puzzling question here