Of course they aren't discriminated against everything..
Let me put it this way,
If someone has more rights than another person. If complete equality doesn't exist for two groups, there are only 3 ways to achieve equality.
I'll use women (which represents minorities in this example) and men (who represent majority)
Either men can give up some of their rights and bring themselves to the level of women (Let's use equal pay as a way to further this example). So men can accept lower pay to have it equal to the woman's pay.
Or, a woman can get higher pay to make it even to a man's
or, they meet somewhere in the middle.
Either way, it is a relative loss for the majority group. That's why it's so difficult for equality to come around, because either way the majority group has a relative loss, in a sense.
So by feeling excluded from this small group, I don't think it's an issue personally. They want to form a community based on their race because maybe they can relate to issues with each other. I wouldn't personally join ____singles.com for anything, but who knows. Who cares? In not minding people from joining communities, I don't feel threatened. It doesn't have much to do with me.
Also keeping people from forming these groups when they feel bound to certain aspects of their life which are harmless to people, such as their race or orientation or religion, it would ignoring a lot of what makes that person feel like a person and that deserves it's own attention and respect.
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