Sadly it's the nature of the internet and social media in particular. Extreme views are given disproportionate "airtime". It gives nasty people a platform to peddle their extreme views, nastiness, etc. "Real life" away from the screen continues to be completely different.
I try to get this across to our DS who sometimes gets quite upset/annoyed by random things he sees on social media and thinks that people in real life are the same. We have to keep reminding him that people are more "normal" in real life, and he does take that onboard and often mentions people being "surprisingly" nice when he meets new people in real life! In particular, he was really worried and stressed when he went to a couple of job interviews in person as he'd just read himself into oblivion on the internet at the way interviews try to fool you, catch you out, etc., but both times, he came out visibly happy that they'd been so nice, he'd been given tours, everyone had been friendly, etc.!
A classic example was our local football club. On social media, you'd think the manager was the devil in disguise and that no one liked him, everyone wanted him sacked, etc. But if you actually took time to look at the names of those posting, it was always the same small number of people in their own echo chamber, just saying the same things on multiple posts and across multiple SM platforms. On the terraces, when talking to the people around you, chatting on the way to/from the ground, etc., the vast majority were supportive and liked the manager! That's something I have to keep reminding our son whenever he as a "wobble" after looking on social media!