Ignoring evidence that contradicts your coherent view of a person or situation. A form of confirmation bias.
As we start learning about a subject (person, event, etc) we begin formalizing opinions about it immediately. Sort of like the how the first voice in a crowd has a disproportionate effect on the opinion eventually reached by that crowd - the first things you start to learn wind up taking precedence in your head over things you learn later.
Looks like Confirmation Bias and contributes to the Noise of Crowds (i.e. not wisdom of crowds).