He can't be a right wing extremist because he supported a fringe democratic candidate.
When anyone who strays from your self-righteous, moralizing worldview is a right wing extremist...that term ceases to mean anything.
My only point though is that the left hasn't been self-reflective whatsoever. They still have the Hillary-esque view that the rest of the country should apologize for the last 4 years, and the deplorables ruined everything. They're absolutely dripping in working class resentment and it's pretty clear.
Instead of asking themselves how they could lose to an absolute moron and do the hard self-reflection that would maybe reveal how they could appeal to the working class and disenchanted - they just yell about Orange Hitler and how right they were all along.