No trump supporters?

Is it right for a business to determine their customers based on political preference? I personally think this is ridiculous, however i would never shop there anyway due to their outrageous prices. Someones political views should have nothing to do with whether you want them doing business with you or not. You're making money so why would you not want more customers? Trump haters dont like him for being rude, but the ones like this sure arent helping our country any