You have to aggressively seek out opinions and viewpoints that you disagree with. Even if - especially if - they make you feel uncomfortable and annoyed. Read a

You have to aggressively seek out opinions and viewpoints that you disagree with. Even if - especially if - they make you feel uncomfortable and annoyed. Read all of the opinions that people say are garbage, make them sick, get downvoted, etc. Whatever your ideology is, find and read as much content as you can from the other side. You may feel especially weird if you intentionally spend a month or two in an artificially created filter bubble opposite to the ideology you hold now. Feeling anti-cop after the most recent string of incidents, for example? Try making an effort to ignore anything critical of the police and read only sources from or sympathetic to the police for a month or two - you might be very surprised how much this changes your point of view, and find yourself in a better position to see the full picture of an issue. Have faith that if an opinion really is nonsense, you will be able to realize that on your own, without taking somebody else's word for it. On the other hand, you might find that yourself and the people you agreed with are wrong, or biased, or missing an important perspective.