Most non-professionals are familiar with the generic Asperger male...the geek, who loves to discuss trains, and is socially awkward. Others have no idea what AS is. So, it is normal for people to react in a surprised way, especially if the AS is mild.

If you are not female, disregard the following:

Not a lot is known about female AS. Most studies have been done on males. Ladies tend to be less alexithymic and manifest the syndrome more subtly. More severe cases tend to fit the generic male mold.
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Sensory processing issues are known to interfere with socializing and cause anxiety(AKA sensory overload).

Special interests are typical AS. Lifelong interests ebb and flow. New interests often develop, that are not directly related to the main ones. They are quite intense and can interfere with life, such as eating. For example, my areas of expertise are biology, astronomy and meteorology. I read a lot about these topics, regularly. Sometimes, something new will come along, such as emperor penguins. My main interests are then put on hold. I will research the new topic, until I become an expert. While, I am doing this, my life is put on hold. (I find this quite disabling.)

I hope this helps.