I had an argument with my sister?

My sister always accuses me of being being negative or complaining when I'm actually not. I got tired of her behaviour of always accusing me of things that are not true so I told her that she deserves that she has a autistic child. She came off with more insulting words and I got more distant from her.

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I can't earn money cause I'm mentally slow and have a right arm that's disabled, she puts me down for it even when I said nothing about her child.
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My question is what should I do about my sister and who was wrong?
I had an argument with my sister?
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