You are not a teacher here. Nor are you a parent. Your stance is completely paternalistic and pedagogical. By being judgmental you can not achieve anything but loss of friends. I know you are a cute girl with a cute heart. Why then would you go around and annoying people by pointing mistakes in what they write, mistakes which they are completely fine with, but which only bother you. When you are their teacher, or had you happened to be their parent, you would have all the liberty to strike upon them like thunder.