This is only true if everyone agrees on facts. It is perfectly reasonable for people to get shocked by the other side's views if they do not disagree on the facts. When people are in fundamental disagreement with other viewpoints, I would say their behavior is often one angry message away from the anonymous troll personas. It is a very short fuse.
A good example is the idea of the "cancel culture". Do you think it is a reality? Someone like Stefan Molyneux would say yes. Someone like AoC would say no.
The person who thinks cancel culture is a real thing will say things which just seem completely idiotic to the other side, and vice versa. And they are still using real names.
Using real names in fact becomes a liability if there is actually a cancel culture. So, for example, I am safer making this point anonymously. If I accidentally end up offending you, at least I don't have to worry about losing my job.
That's the point, isn't it? A person can be good or bad, but when you group people together via social media, you find out just how many of them are just terrible human beings. People acting like humans is exactly what you don't want to happen.
The psychologists and drug companies would love that.