Single white men not allowed at sex party, only black

A sex party was arranged in Holland where only couples and single black men were allowed.
Single white men were not allowed and some of them filed an official compaint.
Now an official bureau against discrimination has to investigate this matter to see if this was lawful or not.
The company said that it was a closed party and that they could invite who ever they want.
Although this is true, the probably aren't allowed to do this purely based on skin color.

Here is the link to the party. it doesn't say it is a cuckold themed party, but if it talks like a duck
The hyperlink is visible to registered members only!

I don't see the problem, maybe they should just allow the white guys to come in, they will probably find out that the white women don't want to fuck them anyway
Maybe next time they should do it based on dick size. <7 inch not allowed