I actually can. For real. I can not get job or housing anonymously, but overwhelming majority of my real life interactions are anonymous.
(Now I am old, so it's different.)
It was very freeing to be able to talk about my interests (e.g. space, web development, and video game modding) without being subjected to the bullshit that people brought to the table if they saw me.
I shouldn't have to show an ID to buy a newspaper or to load the website of a newspaper. On the other end of the spectrum, I should not be allowed to buy a gun without showing an ID (and all sorts of other constraints).
Somewhere in the middle, I understand that we don't want to expose 8 year old kids to pornography, but I don't think that one has to wait to be 18 or 21 to be allowed to access it. Same for social media. Where and how exactly we set the limit is a societal choice to make.
I also believe that "living in a democracy" doesn't mean that "everybody agrees with me, always". Many times I am in the minority. What matters is that people are informed. Telling them that if they disagree with you they are either bad parents or fascists isn't constructive, IMHO.