Some folks - Not so smart

So, exactly why is it that so many people seem incapable of separating an email address from a person's actual name? I've got a friend, named Aaron, who uses his initials for his website and consequently his user id on this system as well. His primary email address that he hands out is mail@hisdomain, yet people often think his name is Al. I have even more fun, since my domain is AndySocial, and I get people (who apparently are less endowed with a sense of humor than I had expected) emailing me as "Dear Andy" on occasion. Even better is when I email someone and they respond to "Andy" when my email return address is quite clearly "Gary Bunker (andy@andysocial.com)". Makes you wonder how smart you don't need to be in order to operate a computer nowadays. Twits.