If we had a society that would tolerate it and help the kid capitalize on it, then no one should care. But we have a society that doesn't, so the kid will be hurt by it. For dyslexia, it might not take a major change. Use fonts that work better. Not care as much about spelling and focus on their own talents. Allow them access to a spell checker. Stop using the same metric to measure their performance.
But if you take someone on the autism spectrum, the level of change needed so they won't be hurt by it seems like it would require a miracle somewhere on the scale between bringing back Elvis and world peace.
We can help them cope, we can help them leverage their advantages. But give our current society, there are some differences that are going to cause a lot of hurt and pain, both while growing and once they are adults. In those cases, anyone who cares about the kid should care.