Terry,
There are other factors that needs to be considered, the person who you spoke to does not simple live his life in this conversation. The conversation ends, and one or more can take place:
Illogical reasoning
Influenced by others
Effected by the environment ( environment in the psychological sense meaning that the place this person his and the people he is interacting with forms part of the environment, and this environment changes the way this person thinks because it effects our biology.
A pre ordained idea about you or death.
These are just some of many explanations concluded through scientific evidence, but as well it's important to understand human nature.
In a nutshell - PEOPLE SEEK CONSISTENCIES AND AVOIDED INCONSISTENCIES -
Our brains has this inbuild function that does not want conflicting ideas, it does not care who is right or wrong, it just wants avoids dissonance as much as possible so that we can live longer, negativity during the course of time becomes more and more blurred that when we recall a bad memory it never seems as bitter as it was. (unless you have PTSD).
Look back to the history of man kind to the amount of stupidity that took place for one to feel wanted and accepted by others, for dead gods and dead kings and dead languages and dead cultures.