"confirmation bias, n. orig. Psychology the tendency to see or favour new information which supports one’s existing theories or beliefs, while avoiding or rejecting that which disrupts them." OED

Confirmation bias is a cognitive strategy that occurs when someone is presented with too much information or information that might challenge their pre-existing ideas. In these situations, a person only notices the information that confirms their biases or existing theories and beliefs. If you come across something that surprises you or contradicts your pre-existing beliefs, do more research! Don’t automatically assume you’re wrong or that the new information is false; continue your research and find out more before making a decision.