My son is 2.5 and is on the spectrum (high-functioning), but our speech therapist had an insight that I thought could possibly be helpful. He had pronoun reversal at first, and she pointed out that there is a difference between simply switching "I" and "you," vs. if they are saying what they want you to say, which indicates more of an issue with initiation of a conversation (eg, "Would you like some more water?"). In our case, it was some of each, but I mostly felt like he was giving me my line, so I worked on helping him initiate the interaction from his point of view instead of mine. For the simple reversal, I did a lot of putting his hand on his chest and saying "I" together, and his hand on my chest and saying "you" together. Good luck!
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