Especially in Vancouver, most people should be pretty aware that anyone with Washington/Oregon plates (which I'm guessing is what you have) probably hates Trump more than they do.
I've never understood why somebody behind me on the road would care at all about what my political views were anyway. I guess I get it during an election, maybe (in a grammar school "inventor contest" which happened to be during the 1980 US presidential election, I invented a bumper sticker sleeve that attaches to your car, so you could swap out political bumper stickers after your candidate lost. I didn't win the contest.) But in the end I don't really understand putting any sort of social signaling of any kind on my cars, though it seems hard to avoid even by just the kind of car you drive.
Closer to topic, I've always thoroughly enjoyed my trips to Canada, and can't imagine why people think "it's just like the US, so why bother" as seems to have been expressed ny some in this thread. I somewhat recently drove up to Roberval, Quebec from my home in New England, and it was absolutely nothing like the US. I find the rural Quebecois very odd, refreshingly direct, and enjoyable to hang out with.
Perhaps in the white vs black experience lens that most of my US friends seem to see every world conflict through to relate to their own history (wild conversations about Middle Eastern politics there being racial), it's like wearing something racially inflammatory to the wrong neighbourhood. If one's blowing $$,$$$ on bespoke fly in tourism you can probably get away with it with a polite topic change as tourism keeps food on the table, but park a Trump sticker on a residential street I'd be surprised if even in the nicest neighbourhood there isn't some damage to it. Likely from a teenager goofing off with friends in the current environment.
To the second individually most Americans are nice in my experience, if you are seen as a person and not anonymous in the crowd. I've had a family member get a rifle leveled at them for stepping over a property line in the US where clearly they weren't seen as a fellow human... what can I say to that or the normalization of it.
