It's not. Take it from me, a guy who predates social media by decades.
If you go back and look at what Gary Hart dropped out of the 1988 presidential race for, and compare it to what Donald Trump said on social media before, during, and after being elected President, there's just no comparison.
Racial, misogynistic, derogatory, offensive sentiments you can easily find being published on Facebook, Twitter, YouTube, or most other social media platforms would not have passed muster in any mass-media channel or public conversation 30 or even 20 years ago.
On the positive side, social media has been a tremendous boon to marginalized communities like gay/lesbian/bisexual, transgender, heck, even furries. It has allowed like minds to find and support each other, and allowed the rest of us normies to see these communities for the constructive, positive forces so many of them are. I am convinced that social media aided in their growing public acceptance.
In fact, I'd say that social media has opened up the discourse so much that even the resignation of a powerful figure over controversial remarks about pedophilia--an outcome which would have been expected and commonplace for at least the past 70 years of U.S. society--are taken as somehow problematic.
In other words, things are so de-censored now that even the most anodyne and obvious objections to gross statements by powerful figures is taken as censorship. The Overton Window has moved way over to one side, but people still complain when they hit the edge of it.