I've experienced the same, though in my case I don't think it has anything to do with my mental illness.

A plumber was supposed to come on the 24th in the morning. He asked me to text my address. I did and he never showed and never acknowledged my text. When I email my brother and certain others, they never acknowledge it. I read story after story in the newspaper about how many newlyweds don't even send thank you notes for gifts. I guess it's a change in communications, or lack thereof. Even customer service sucks, nowadays. Young people show less respect to adults.