I am a foreinger.
I have learned the language, mixed with locals, worked with them, befriended a few, married one and spend the vast majority of my time with them. I am pretty well intergrated.
However, as soon as I see a group aimed toward people who speak my language or who share similar experiences with me of being a foreigner, it sparks my interest and I check it out.
Being a member of such a group is not the same as being unwilling to intergrate. It gets people out, meeting like-minded individuals and gives them a little taste of normality before they go back to their day to day lives.
I have no problem with them excluding Brits, although they ought to have made their club rules clear from the start.