The term alt-left started on racist websites in Nov 2016 for false equivalency

[BainsBane]

88. Those terms aren't used to describe people who self-identify

They are used to insult people who care about equal rights, equality, and anything other than the increased privileged of a demographic that already makes well above the national median. Or they are used to attack anyone who doesn't adore their favorite politician. People do it to proclaim themselves superior, and in many cases their arguments begin and end with such insults.

I've been insulted as corporatist and establishment by people who make more money than I'll ever dream of, who have no idea what it's like to be poor, and who have never articulated a leftist position on any issue. I've had those terms hurled at me after telling someone I agreed with them on the issues they listed as qualification for being considered progressive. That particularly vitriolic response, compelled by similar treatment of Chuck Schumer, showed me there is nothing they despise more than having people they believe inferior to themselves agree on issues.

Then they cry victim when they don't like terms they think apply to them. It's rather bizarre they've so eagerly decided Trump was referring to them as "alt-left" when they didn't protest in Charlottesville and rarely if ever express concern about racism or the rise of fascism in America. Trump wasn't talking about them. Yet they had to make the events in Charlottesville, like everything else, about them.