If you were in a grocery store looking for a certain brand of mustard and they did not offer it, you would go to the next store in search of your mustard. Perhaps the first store does not have that mustard because it comes from Germany and the owner was held in a German concentration camp. The store owner chooses who they want to support, or not support, with their dollars.
You, as the customer, can choose who to support with your dollars: you can buy a different kind of mustard to keep your business in the same store; or, you can go to other stores to find your desired mustard.
You do not have to judge the store owner for his bias.
The store owner does not have to judge you for your taste in mustard.