A couple of things here.
First, on top of your ASD you're probably also an introvert. Introverts loose vitality with too much interaction, especially when it's taxing, like when you're bullied. Social interaction, at work, with friends, at events etc, can give us more confidence, but it can also make us more reluctant. Aside from work, I hardly see anyone other than my wife and son. Social interaction usually feels like a net loss for me. Any gains are too often outweighed by anxiety and my intolerance for superficial exchanges.
Add ASD on top of that and all of the above seems magnified, confusing, often illogical, and too often one-sided. So we stay where anxiety is either absent or tolerable, where we don't have to put on the mask, and where, if we're going to waste time, at least it's on our own terms.
And for some reason, a lack of social functioning seems related to functioning in general. It's like, the more active I am, the more I get done in other things.
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I'm not blind to your facial expression - but it may take me a few minutes to comprehend it.
A smile is not always a smile.
A frown is not always a frown.
And a blank look rarely means a blank mind.