Is it unnecessary to disclose that you are autistic to a guy you are dating?

I am high functioning autistic and some guys I am dating don’t believe that I am autistic. Why can’t some guys tell that I am autistic? And if they can’t tell then does it mean that I shouldn’t tell a guy I am dating that I am autistic?
Is it unnecessary to disclose that you are autistic to a guy you are dating?
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