What about a mixed race couple, that is choice and there is nothing wrong with it. How about a Christian and a Jewish person?
How about a Canadian and an American?
All choices, all legal and acceptable.
All choices, and as such, can be discriminated against. All I'm saying, if you read my previous posts, is that the employer should get to decide whom she wants to employ. It's her money she's spending for labor. If she wants to discriminate against someone for a lifestyle choice--or even for their gender or ethnicity--she should be able to do so.
Of course, the marketplace will react to her and perhaps show her that she has behaved foolishly. People may stop doing business with her. Workers may choose to voluntarily work elsewhere.