Everyone's biased. The fact that we all have different life experiences makes it that way. Some biases are conscious, others unconscious. Regulatory systems are designed to minimize bias and generally they do a pretty good job.
As for reactions to accusations of bias, get over it. A lot of people around here seem a little high strung. If you are one of them and you are accused of something, step away from the keyboard, take a deep breath, remember: "spaceship; computer game" and if you feel the need to defend yourself, do so calmly and logically without making accusations of your own and potentially making things worse.