Cognitive biases, we're all guilty of it. But it isn't all that hard to avoid as long as you remember to consider it.
Cognitive bias according to wikipedia:
A cognitive bias refers to a systematic pattern of deviation from norm or rationality in judgment, whereby inferences about other people and situations may be drawn in an illogical fashion. Individuals create their own "subjective social reality" from their perception of the input. An individual's construction of social reality, not the objective input, may dictate their behaviour in the social world. Thus, cognitive biases may sometimes lead to perceptual distortion, inaccurate judgment, illogical interpretation, or what is broadly called irrationality. ...[Continue reading on Scientific Literacy Matters]