You have to distance yourself from European thinking here. The US is far less internally divided then Europe ever has been on such matters. The reason we have swing states in the US is the fact that most counties and states are so homogeneously either democratic or republican, you can't break in there. That's goes down to county level even in the swing states. These people live in environments where now likely, they only have people sorrounding them sharing their views. This is also why Trumpists tend to not believe polls: how can they show Drumpf down when everyone sorrounding them is voting for him?
Because of this, the "shame" factor is considerably smaller in the US. Living in rural Florida, there is no stigma connected to declaring for Trump. That's the difference to radical parties in Europe, where their voters most likely are in the minority no matter where they live.