Incorrect, if my school experience was any guide.
Schools do have a right to maintain an orderly learning setting. That has been established in law, in terms of a dress code etc. If a student comes to school wearing a KKK sheet, that would truly present a problem in maintaining an orderly learning environment.
The problem is, this woman wasn’t operating within any existing guidelines/rules etc. She INVENTED the idea that wearing a Romney/Ryan shirt was the same as wearing a KKK sheet and badly mistreated the student. She had NOTHING but her own delusional biases to back herself up.
That’s why what she did cannot stand. It isn’t because a student has rights to wear anything they want to school, no matter what it is.
Politics is another reason the school system might to shut the idiot up: If Romney becomes President the DOE will be under this authority as does that school’s budget. She is essentially disrespecting her new boss.