One has only to look at what happened the last night of the RNC as attendees walked from the Whitehouse to see why, as a republican, you never show your support of Trump to anyone you don't know.
Only my conservative friends know I will vote for Trump. I do not share with people here in the land of fruits and nuts that I am a registered republican.
I still use my mom's address. Where my mom lives in San Diego County, it is one of the areas that still votes republican, so I am among allies, and my vote will help elect a conservative local mayor.
My roommate is very sweet and has never protested, but she watches Rachel Maddow. I don't want her to see I am a registered republican. I know she is a registered democrat, as all her family is. She still votes from her parents home in Northern California. An uncle of hers is the campaign manager for Eric Swalwell, who I think is an absolute idiot, so there is that. I am sure that way Swalwell gets one more vote from her when he is up for election again.