No, I don't believe all trumpers are racists; I think a goodly number of them just don't care that Trump and "half" his base are... They just don't care that racism has real consequences to real people...
That's just another way of saying they're all racists (just some more active and some more passive).
You're still denying the truly, actually non-racist option: righties considering racists such a rare and far-off thing, so unconnected from most people's real-world experience, that they seem to be a deservedly tiny, rightfully irrelevant, almost hypothetical speck in the big picture, having nothing to do with what most real people think, say, or do. It's hard to believe any particular sort of movement is really a big deal if you never meet a member of it or have one of their events come to your town. It becomes just something you know technically describes somebody somewhere who has nothing to do with you, and some people out there accuse each other of a lot, but those accusers are the same ones who also accuse you of it yourself, and you know it's a lie in that case, so you have no reason to believe it in most other cases either...
For a parallel from a progressive perspective, just think of any straw man you see the left getting painted with too much that you know does describe some few real people somewhere out there who have no relevance to your own progressivism. Just recently I saw someone saying modern progressives want to end any & all law enforcement. I have no doubt that somewhere out there, there are some lefties who want to end law enforcement, but why would the rest who don't want that and have never met anybody who does ever identify with them? Or for somewhat more of a classic, Soviet infiltrators and their collaborators; there certainly were Soviet infiltrators & collaborators trying to influence American Cold War politics to the left, but why would the rest who weren't among them and had never even met one ever identify with them?
The equivalent of the argument you just made is an attempt to impose exactly that kind of identity on you anyway no matter how irrelevant it actually is to your real identity. "Lefties
don't mind being on the same side with people who want no law enforcement at all." "Lefties
don't mind being on the same side with Soviet infiltrators." The invalidity is transparently obvious... which means anybody who seriously actually makes that kind of claim is being transparently obviously dishonest.