>It is legal, but, I believe, completely unacceptable to just about everyone.
This is not true in my experience. Many people on the left, particularly under 35, earnestly believe that their political opponents are by definition racist and evil. In a manner similar to how I would not want a literal neo-nazi on my company's payroll, they do not want a registered Republican on the company's payroll.
Edit: In other words, this kind of bigotry is actually acceptable to a disturbingly large number of people.
This is not true in my experience. Many people on the left, particularly under 35, earnestly believe that their political opponents are by definition racist and evil. In a manner similar to how I would not want a literal neo-nazi on my company's payroll, they do not want a registered Republican on the company's payroll.
Edit: In other words, this kind of bigotry is actually acceptable to a disturbingly large number of people.