Online you do not interact with "regular people" but people who put the most effort into online presence and those people are overwhelmingly individuals with very real mental disorder on the narcissistic spectrum often with other comorbid disorders.
On social media in particular you are exposed to both narcissists and in general a narcissistic mode of communication - because that's what social media is. Social media is a vehicle for turning an individual into a narcissistic persona. So even if you are not narcissistic in real life your social media activity will make it look like you are.
Social media is very unhealthy. It is a recipe for a mental disorder. It is primarily used by people with mental disorders. It is designed by people with mental disorders.
Quit social media—these online free speech advocates just want more people to pay attention to them which leads to more screen addiction. It's cancer for your soul. And I am not sure I am just being metaphorical.