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This happened at work earlier today. I will not use my companieś name and the names Iḿ using are fake for privacy reasons.

Iḿ an order picker at an appliance store, I pull peopleś online orders so they can be delivered. Also, Iḿ fairly new to the job so Iḿ still learning the ropes.
My coworker, Collin (whoś also new here) and I were pulling orders and we had to get a microwave off a second shelf (tall warehouse shelves). We couldn't reach it and I don't have my order picker certification yet, so Collin told me to get Daniel.
I never met Daniel before this, but Collin knew him somewhat. He's about 6'5, and I can tell he's autistic from the way he talks, walks, and acts.
I go into the receiving office and found Daniel by his name tag. I asked just like I'd ask ANYONE ELSE and asked "Hey Daniel, can you help us get a microwave off the shelf?" He then asked "You guys can't reach it?" and I replied, "No we can't."
He laughed at me showing he has multiple missing teeth, walked off, started talking to someone else, and didn't even help us. I stood there wondering what the fuck was his deal. Collin and I got the microwave by climbing the shelf, which is against policy and we could get fired for that.
A moment later, Daniel was talking to Collin about how everyone treats him like a bitch and he didn't like the way I talk.
THAT PISSED ME OFF!! I talked to him normally, I simply asked him for a favor to get a job done, he scolded me, and he didn't have the stones to say it to me and told my coworker. We're trying to get the job done, yet he didn't want to help because he didn't get his princess treatment. Does he want me to kneel down and kiss his ring before even breathing in his direction?
The only reason I didn't confront him is because he's mentally challenged. If he was an average Joe I'd have put him in his place. I'm not talking to him and I sure as hell ain't helping him.