What they said was they were glad the people involved on the kapa haka group were more inclusive than you.

You then flew off the handle at the minor slight. They then joined you afterwards.

You were doing great with the argument that the curriculum shouldn't be shaped by outliers. Simple, factual and not attacking the person - just debating the point constructively.

This appears to be a reading and comprehension issue (possibly complex dyslexia if there's an autism diagnosis that early on in the kids life?), you perhaps could have stuck with that? I dunno, you do your thing. I'm just pointing out how needlessly rude you were.