A big problem I have is with people who claim to "discuss" things and really have no intention of doing so. Sure, they seem to ask questions but really they're only interested in making you believe what they believe, end of story. They're right, you're wrong...why bother? I'd almost rather talk to a wall. It has just as much understanding. Any "conversation" where every comment you make is brushed off is frustrating. Oh, well...I choose to open my mouth, or type my thoughts, as it were.