I'd say it's a reflection of an earlier stage of interpersonal maturity to try and put people into categories. More socially attuned people realize the complexity of other people and situations and synthesize all the available information to make a decision that is truly reflective of reality.
You must have read Changing on the job :p
I would even go so far as to say this is the general pattern of individuals learning models with explanatory power for dealing with reality. First, you learn the model, you try to apply it absolutely everywhere even in places where it won't work, you learn its limits, you then synthesize it into your holistic understanding along with every model you've learned thus far.