Full disclosure - I did not vote for Trump. However, I do know a lot of people on both sides of the political spectrum so I will give you my theory on the Right’s tacit acceptance of Trump and the Alt-Right.
First of all, OP, that you identify as “cisgendered” is part of what you don’t “get”. A lot of people don’t like this atmosphere of extreme politically correctness and identity politics. Like why is being part of the 95% of Americans who are heterosexuals who culturally identify with their birth gender considered a “thing” that needs to be called out? Or similarly, now every Halloween costume seems to be under intense scrutiny so as not to be considered “cultural appropriation”. Sure, we can all agree that “black face” is not acceptable. But depending on who you talk to, Pancho Villa style costumes, even historical figures like Cleopatra are considered “un-PC”.
Everything seems to be “bias” this and “microagression” that. So if you are a white, heterosexual, “cisgender” (especially male) with a good job, there is this perception that to “Progressives” you are the enemy.
So that’s just the PC culture stuff.
On the economic front, there is a perception that Liberals hate business and rich people. People like Bernie Sanders and Alexandria Ocasio-Cortez have done little to help this perception. Contrary to popular belief, most conservatives are not “stupid white trash hicks” (more on that later) living in Iowa. I don’t have to drive more than an hour outside of Manhattan to find a Trump sign (that isn’t attached to one of his buildings). Most of the conservatives (also libertarians and objectivists) I know are solidly middle class or working class suburbanites. People who are more likely to be working/worked at AIG, Lehman and Arthur Andersen than sitting in Zuccotti Park in the middle of the day banging a bongo. So their perception is that Democrats and Liberals want to come in, over-regulate and tax businesses and hard working people to set up programs for lazy, whiny extremists.
Finally, conservatives simply don’t like you (liberals and progressives). They think you are weird and over-privileged, pretentious, crybabies. They know you think they are morons and hicks and racists. They think you are disloyal pussies who shit on the American flag while real patriots take on high risk jobs in the military, police and fire department. People who would rather bitch and moan to legislate stealing from others in the name of “fairness” instead of going out and working for what you want.
Anyhow, that’s the impression I get from my more right-leaning friends.