Twitter, alas, has become a huge factor in campaigns. It leaves candidates with a mostly unpalatable choice. You can work as hard as possible to be inoffensive and avoid the mobs, but then you come across as boring and inauthentic. Or, you can swagger around and either embrace Twitter or ignore it, and face the wrath of the mobs, whose opinions tend to show up in the MSM in short order.
Which is the better approach? It depends on the thickness of your skin, how much you enjoy agitating people, and how well known you are. It works for Trump; for, say, Cory Booker, not so much.
Perhaps the Democrats should nominate Beyoncé. The Beyhive would be more than a match for the rabid right on social media.