I am inclined to agree with genericMind on this one. I think people are reading WAY more into this than is actually there. Many people, possibly most people, use some sort of colloquial word in place of a person's name in casual conversation.
Some people, myself included, find it a bit too "official" sounding to use a person's name every time addressing that person.
Obviously each person should use whatever form of speaking is most comfortable, but I wouldn't read too much into other's people's choices.