I have zero issue telling locally-owned businesses that I won't be using their services or buying their products or frequenting their establishments if I'm able to find out they're fervent Trump supporters. In fact, I already have. I don't advocate public shaming or social media wars or bad reviews on Yelp or whatever. Just a simple email or call to let them know I won't be supporting their business anymore due to their support of Trump.
In case anyone else is interested in how to find who owns a local business, most states have an online database that lists business owners. Usually it's the Secretary of State website or some offshoot of that (if not, Google "your state/city name business name search" . Find the business license or business name search portal, type in a business name and get the info. Then search social media for the names. It's all public record.
Hitting Trump himself is great. Hitting his supporters is good too. Elections do have consequences.