Because our hobby is kind of solitary doesn't mean that we all are socially awkward. I'm pretty confident to say that I ain't.
Same here. I present at lot at work and usually don't say silent for many minutes in social gatherings. I also have a hobbies where I train with other people exclusively.
...but I'm also an introvert and need my alone time. Hifi and gym are good options for doing something alone while restoring energy.
So, I don't believe there as much socially awkward or autistic people in hifi, but maybe the most extroverted people are not the ones to enjoy measurements and tweaking that much.