[header] How to convince your father you are not autistic [title] Non-judgmentally ask your parents why they feel this way. [step] Closely will help you understand exactly why they have come to this conclusion. If you understand it, then you can be ready to refute it. 
Here are some questions it may help to ask : [substeps] What symptoms have you noticed in me? What sort of research have you done? [title] Take some time to consider what they have told you. [step] Where, exactly, could they be mistaken, and why? Is there any truth to their words? Take some time to think about it.