Overblown PC BS.
This is supposed to be a TOLERANT society, not a society of denial of individual differences. The first step to tolerance is acknowledgement of differences, not a thoughtless chant "we're all the same and equal". Every staircase the kid encounters will remind him of being different, because no matter how you slice it, there's a difference in ability to use stairs between him and others. And the assumption that he's not strong enough mentally to overcome that conflict is disgusting and tells a lot about society itself. We've got a long way to go.