I started dreading my senior year of high school, I live in North Central area of the US, and no administrators ever said anything. I did get questions and the usual stares though. No underclassmen dared to say anything, and there was a guy whom whenever he saw me would quickly call out my FULL name followed by I LIKE YOUR DREADS! Everytime. 
Just go with it and enjoy your journey. like everyone else said, you have rights. Just be peaceful and informative.
