I think this is a problem inherent to this style of communication, whether massive social media or individual niche forums. People used to talk a lot about groupthink, though I don’t hear that term as often today. It seems to be a fundamental thing for human beings to come to a consensus as a group, and then for some individuals to react to that negatively. When positive this looks like science, accepting consensus as truth to have a foundation to work off of, and individuals rejecting the consensus to build stronger foundations.

Outside of the Internet we have much less ability to change our environments, so there’ll naturally be more diversity within groups of neighbors, coworkers, students, etc. But here, there is so much less friction to movement, similar people tend to group up more quickly.

The solution is probably not to expect opposition within a group, but to be a member of many separate groups. You are definitely in an echo chamber, but at the end of the day what you choose to accept as true is your responsibility.