A system can personalize your world until disagreement looks like an intrusion.

When everything you encounter has been selected to suit you, encountering a genuinely different view starts to feel like an incursion rather than an ordinary fact of living among other people. The reaction is out of proportion because the baseline has been made unnaturally smooth.

Deliberately keep some sources that do not agree with you and that you find intelligent. Not the worst examples of the other side, the best ones. The aim is not to be persuaded. It is to keep disagreement feeling normal, which is what makes it possible to think about.