But as is so often the case when liberals use a double standard, conservatives suddenly discover it, too. Partisans on the right were often outraged by crude attacks on Republican presidents. They condemned such epithets as offensive and disrespectful. Now they think they’re great. If the left should lighten up, the right should grow up.

Part of the problem driving this coarseness is the breakdown of the blood-brain barrier between social media and real life. Often, what’s funny or arguably defensible on Twitter, TikTok or Facebook is simply inappropriate in real life.

The way social media encourage people to behave like jackasses is itself part of a deeper and more pernicious trend in society. In his book “A Time to Build,” Yuval Levin catalogs how leaders — in politics, business, sports, media — increasingly use their institutions as “platforms” to perform on, rather than the organizations molding their members to specific missions. De Niro used award shows to lecture and scold. Colin Kaepernick used the NFL as a platform for his causes. Trump saw the presidency as a stage on which he could celebrate himself.