With the usual disclaimer that 'every situation is different"......
When I do what you people like to call 'isolating', it's kind of because stuff has gotten overwhelming and I just can't deal with it anymore. It's not a feeling I LIKE. It's not a feeling I'm happy with. It's not a feeling I expect the rest of the universe to tolerate. I am perfectly aware that other people have expectations and that I'm not meeting them. Believe me, I spend a fair amount of time telling myself that my inability to meet their expectations makes me the lowest form of life in the universe. Right up until I really can't take it anymore and decide that, if everyone hates me and wants me out of their lives, I understand it, but at least I don't have to deal with disappointing them anymore. Meanwhile, I usually TRY to meet expectations. Which means some things I might answer and some I might not.
And, you might be surprised at how different yes or no questions can be when it comes to how hard they are to answer. "How is the other person going to take my answer? Will they be disappointed? Will they be angry? Will they think I'm crazy? Is it safe to tell the truth? Is it necessary to spin the truth?" All one word answers are not equivalent.