You should thank them for putting up the sign.
It is good to know who is who if we have times of troubles...
Take a picture.
Then if your neighbors put up a Biden sign, and come to you for help when the SHTF... show them the photo.
But I see that Biden sign every time I look out the window.
So I figure they can look at a Trump sign.
I live in Durham, NC which is mostly DEM territory.
Not very many Biden signs around. Not like when Obama ran.
We also signed up to be poll watchers during early voting.