I'd be tempted to ask, very nicely, about the poster. Something like "I've never seen that poster before, what are you hoping people get from reading it?" If they say, "people are all the same," then you have some important information about their likely inability to work with differences that matter. If they say, "that there are differences between people, but not all differences matter (ex. skin color, height), so we treat everyone with respect," you know you are dealing with a more positive intent.
I'd also ask - or ignore. There's a chance that the poster was put up by someone else and no one in the admin or school is even paying any attention to it or thinks anything of it. It stands out to you because you're in the midst of advocating and also acutely aware of your child's differences.
I used to cringe in middle school when one of ds' main teachers (who was a *wonderful* teacher) used to bring this up every time we'd have a discussion about ds' challenges/accommodations/etc - she would always say, at some point, "pbDS, everybody has *something*" (meaning everyone has their own challenge that's tough to get through). I hated that because it felt like she was comparing the significant challenges that ds was facing with classroom work due to things he couldn't control (dyspraxia in his case), to someone like me who had a tougher time in English than in math. I thought it was coming from a place of not understanding. However.... while it was grating for me to hear... ds heard it repeatedly, understood where the teacher was coming from, and he took it to heart... and now that he's moved on from middle school and is on the threshold of adulthood, he still holds it in his heart... his teacher recognized that his dyspraxia didn't define him, and that everyone has their own "something", and his dyspraxia is just that - his "something". Not something that defines him.
Sorry to ramble off course - good luck as you move forward with advocating!
polarbear
