Confirmation bias is like when you're absolutely convinced that pineapple belongs on pizza, and you only pay attention to the people who agree with you while ignoring those who think it's a crime against pizza. It's the tendency to seek out or interpret information that confirms your pre-existing beliefs, while conveniently overlooking or dismissing anything that contradicts them. It's like having a filter on reality that only lets in the stuff that matches your opinions, making you feel all warm and fuzzy inside, even if you're living in a bubble of your own making.