When people say that "everyone else does it" I think it is a way to get what they want. They try persuading someone by saying that everyone they know does it. It's one of the easiest ways to get what you want without having to do much. I have experience with that, I asked my mom if I could get a piercing and she was completely against it. I tried everything to convince her but it didn't work. I told her that some of my friends have piercings and when I told her who they were she gave me permission to get it.