1. the fact you as a member of the forum have an idea of what a clan should or shouldn't be doesn't mean it is the only conception possible for the whole forum. Just like the fact someone has a religious belief doesn't mean it's or should be the only valid one for everybody else.
2. There is a difference between 'active' discrimination and something that can be perceived as 'discrimination' but is just on the personal preference level. I 've the impression this is why we don;t agree. You see this as active discrimination, while I see it as a user preference that, as long as it stays just as the way OP phrased it, is perfectly fine, just like 'want to have a clan of US based players' or co. These are very different statements than to say ' I want to only play with Us players'. Of course, the supporters of the latter would likely be also inclined to the former, but the opposite is not true. I believe you are over reacting and because you are, as everyone should be, worried of the second one, you then overreact on the first one because it can lead to the second one.
Cheers.