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.