It's an automatic thing for me, too, but more and more I'm trying to be conscious of it. I realized that people who knew me in different capacities sometimes had completely different conceptions of me, and somewhere along the way the "real me" was getting lost in translation.

edit- In terms of ethical vs. logical types, I think it's a continuum. Everyone does it to different extents, but ethical types are more to one side of the continuum than logical types.