Its not so mucht that they hate you or the UK as they are just stupid, its a plague that cannot be escaped in online gaming. Its just the nature of the beast when you get so many wet-behind-the-ears gamers out there who have mommy and daddy pay for everything, their spoiled brat personalities carry over onto the games. I see it every day in the chat on WoW, people talking crap just to see the text on the screen. My adivce is just to ignore the wankers completely, if they pester you about letting in non-brit people explain that it makes organization too difficult (side note: how the heck is it racist to be selective of clan members based on country, countrys arent made up of single races unless your looking at it from a human level and not color-wise).
As for the Brits-only clan its not racist at all, its sensible if you want to orchestrate any kind of large-scale even. I used to coordinate between
the US, Canada and the UK for an MMO guild and it was a pain to get everyone on the same page thanks to different time zones and all that.