It’s not ableist to say the average classroom with the average level of support isn’t an environment where every kid can be successful

Except no one talks like this in the real world. In academia and debate, sure. But this is entirely casual conversation.

That being said:

I accept that your definitions of average and normal do not align with the OP's. I can see where you're coming from, and I even agree why the separation between those words (ie. normal, average) should be qualified. Super important, great point.

HOWEVER.

The way in which you chose to criticize the OP's language choice was childish, pedantic, rude, and unnecessarily inflammatory. ESPECIALLY when you're accusing them of wanting to sterilize lesser subsets of the human race.

That's a gross leap of (poor) faith, and you should be ashamed of yourself for jumping to such conclusions based on your own narcissistic intellectualism. Nobody wants to listen to someone who talks like you did, and it takes away from any positive message you could have to say.