The principal gets paid, in part, to "deal with parents" (we need to be dealth with LOL) and to maintain a professional demeanor. They set the tone for the whole school. Though I've never been shunned outright like that, there has been enough not-meeting-eye-to-eye over things to have tension. I volunteer also and enjoy those few hours per week and my DD expects to see me, so she does and I smile and carry on. Be as brave as your child is to go to school every day when it's not a good fit.
The last e-mail I ever got from the principal last year ended with "it will be a long time before we are on the same page" and when I see him I smile, say hello and think to myself "I never want to be on your page!"
