On Tue, 26 Jun 2018 13:40:45 +0100, Bod wrote:

A proprietor has the right to refuse any customer without giving a
reason. The Red Hen's mistake was for giving the reason that they did.
Should've just said "I refuse to serve you, please leave"

Not true in the US, Federal law has created many protected classes of
people and some states have even extended those who are protected to
political affiliation. These days it is really just what the wackiest
judge might decide.
If it had been Ben Carson, the Red Hen could be up on charges for
violation of the 1964 Civil Rights Act.