Antisocial. You guys keep using that word, I don't think it means what you think it means.

Antisocial refers to a mental disorder in which people hate others and refuse to interact with them. It is a very serious thing and very different from somebody just not liking to talk to people.

I can't say with any character but my own, but Saya doesn't have antisocial disorder. She's introverted and has some trust issues. That doesn't actually mean that she refuses to talk to people. She just likes her solitude.