from the story ...

The suit contends that the school's assistant principal said the shirt violated the code because it had homemade printing and was inflammatory and that the student was suspended when he refused to remove it

If he would be kicked out for having a hand-lettered shirt saying "God is good," or even saying "Go, Red Sox" because it is against the school dress code, then he has no basis for his lawsuit.

People have rights, including the right to be nice, the right to be hateful, and the right to be stupid, and the right to sing Christmas carols in public - as well as many others. But schools have separate rules, as he should know - and probably does.

If he was smarter, he'd have created an account on Cafepress.com, so he could have bought one professionally printed - now that would be an interesting case ... but that would have required forethought and planning. Hand-printed is clear and proveable. But might not "inflammatory" be arguable? He still could have been shunned, or gotten beat up, oh how tricky human rights and freedom of expression can be!