The algorithm wouldn’t inta-block people on minor differences. It would exclude them from your bubble based on fundamental irreconcilable differences that you and other users have. Again, imagine a global digital social ecosystem with 2 billion users. Filtering out one billion users from the mix still leaves you with another billion. If we go by Dunbar’s number, you can keep filtering down until you get to <200 users but imagine these 150 people or so you know in cyberspace being the most genuine and meaningful relationships of your life.
The reason exclude interactions among two diametrically opposed factions is because they cannot possibly be constructive or productive, at least not in an anonymous online environment. NASA is not going to hire someone who believes the earth is flat. That is fine. Let the flat earthers create their own space agency within their own bubble. Maybe that’s the best way for them to figure things out and wise up or to otherwise continue on in their own misery. Maybe one day they’ll get bored and step outside their bubble by adjusting the toggle on their own terms and come to the realization that they were wrong once they’re willing to listen to the other side rather than having relentless flamewars that only seem to somehow re-enforce their beliefs.