I have a hard time with it as well but, I learned to show I care through listening and being there when they need it. I also try and help relieve some stress in other parts of their life as well. You could try that and see if it works, many times I don't have to say anything people just seem to know.
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Autism is a disorder not a personality trait!
"God grant me the serenity to accept the things I cannot change,
Courage to change the things I can,
and Wisdom to know the difference."