I worked at a Fortune 500 company surrounded by blacks. The rule there was if you had a bumper sticker supporting a Republican your car would probably get keyed.
You said you worked at a Fortune 500 company surrounded by blacks.
I would have quit and walked out before my butt ever hit the seat. However I would have also done a company on site check to ‘see’ what the work environment was before applying for work....so I would not find myself in that situation.