There is no right to discriminate, therefore that's out immediately. You're welcome to hate people based on their skin color, gender, sexual orientation, religion, etc. all you want, you're just not free to act on it.
“The reasonable man adapts himself to the world: the unreasonable one persists to adapt the world to himself.
Therefore all progress depends on the unreasonable man.” ― George Bernard Shaw, Man and Superman
Let's say the person she refused to have in her hair salon was a woman who she believed her husband may have had an affair with. The law says she must cut that woman's hair. Oh, and that woman happens to be a minority. What protection would my friend be granted under such a law? No crime was committed by the woman. But why would my friend be obligated to serve her...just because?
"you're better off on Stormfront discussing how evil brown men are taking innocent white flowers." Infinite Chaos