The issue with this mentality is that creates a viscous cycle that leads to extremism. When you close yourself off to ideas, you rob yourself the exposure to different perspectives and criticism. You will only hear what you want to hear, aka an echo chamber. The issue with echo chambers is that the lack of intellectual diversity and criticism allows more extreme views to take hold. For example, it's easy for an echo chamber to justify imprisoning people they don't like because everyone thinks the same and there's nobody to challenge the bad ideas. Free speech can't be used and applied selectively. It has to be universal and it has be genuinely free. Extreme ideas will get criticized, moderate and pragmatic ideas will rise. There's a reason why genuine democracies tend be tame politically and against extremism. Your mentality lets radicals stay radical while at the same time turning yourself into one. You have to hear different ideas, views, and perspectives even if you disagree, get offended, or think they're vile. Hate, authoritarianism, and ignorance can't be defeated with more hate, authoritarianism, and ignorance.