If you try to act NT while people are getting to know you, they'll expect you to behave like them and to like or understand the same things they do. Then they misunderstand when your AS traits make it hard for you to live with them, and either ostracize or harass you because you didn't live up to their expectations, or worse, feel like you've rejected them.
But at the other extreme, if you act purely on impulse with no regard for other people's needs or preferences, they'll either fear you or make fun of you behind your back.
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AS is a neurological "condition", not a "disorder". Your brain's not malfunctioning, it's just been hardwired differently since early childhood.