This story and several of the follow ups by other children complaining about dress codes and behavior codes and cellphone policies all seem to have the same fantasy. They seem to believe that you can do whatever you want to do any everyone just has to put up with it.
REALITY CHECK
The purpose for K12 schooling is not to show off your fashion, or get you dates, or give you an opportunity to text all day. It's for you and ALL the other students to learn. No one CARES what you think about it. No one cares if you think it's stupid that you can't wear pajama bottoms in school. School is not there to make you happy!
Do you think for one second that any boss, on any job, anywhere would ever put up with this kind of behavior? HELL NO! Try that crap all you kids do to teachers at a real job and their launch your ass out of there so fast your head will spin.
Let's do some fun examples:
Kid: "I think it's fine to wear sweats to work, I think better that way!"
Boss: "Get out."
Kid: "It's my phone and I'll text in a meeting if I want to."
Boss: "You are fired."
Kid: "I don't like my project leader, he's stupid."
Boss: "You seem even more stupid as you now have no job."
See how it works kiddies? Regardless of how little disciple your parents gave you and how much they let you get away with it does NOT translate out into the real world. Even worse if you try that crap on someone outside the work place you may just end up getting popped in the lip.
As far as that kid with the cellphone goes, she got what she had coming and could probably use a bit more!