Bullshitters bullshit for personal gain and amusement.

Most people aren't like that, a few are.

It becomes a lot less interesting and curiosity invoking when you have such a bullshitter in your life. The interaction becomes "the lied about this, so what did they really mean". For example, my bullshitter will often have car troubles, a dead pet (that comes back to life) or medical issues whenever they don't want to show up to a family event.

I can promise you there's really nothing more deep to understand beyond the fact that they've become overly comfortable with using lies to get what they want.