From a legal standpoint, in many countries, including the United States, it is illegal for any organization to discriminate based on race, color, religion, sex, or national origin under the Civil Rights Act of 1964. This includes private clubs if they have a significant degree of "public character". From an ethical perspective, it is generally accepted that discrimination based on inherent characteristics such as race or gender is unjust. It goes against the principles of fairness, equality, and respect for individual rights, which are fundamental to most ethical systems. However, it's important to note that this is a complex issue with many nuances. Some private clubs argue for their right to freedom of association, which can conflict with anti-discrimination laws. The balance between these rights is a subject of ongoing legal and ethical debate. In conclusion, while there are legal and ethical arguments against discrimination, the issue is not straightforward and is subject to interpretation and debate.