I have not seen much of this "clique" phenomenon. And having been to the two most important Muslim places in the World (Makkah and Madinah), i know that the Muslims are very much united alhamdulillah. You will see and find many good friends from all over the world inshaAllah, if you go there.
And also, this website itself is a mixture of all sorts of people, why should it be different in a Masjid? If the Masjid is truly a place for worshipping Allah properly, and the people who go there are upon the sunnah, it should be fine.
A True Muslim would welcome anyone, of any colour or background.. and even it is good for us to be kind and friendly to those of different faiths. Afterall, if they are harmless and good people, we should show them what a Muslim is truly like.
The best example, is that of our blessed Prophet Muhammad
and his Companions. They were of all backgrounds and races. From Ethiopian, Persian through to Roman. - They were all equal, alhamdulillah.
There is many examples of this in Islam. - However, Muslims are weak and distant from these practises because they have not even got a clue about Aqeedah. They dont even have correct understanding of who Allah is, and how to stick to the Qur'aan and Sunnah.. So, how do we expect them to not have any racism, exaggeration, "modernism" etc. - All these are things that come from the ignorance of True Islam. - These can all be alleviated by us teaching ourselves, our families and our friends about Tawheed and worshipping Allah properly, sticking to the Quran and the Authentic Sunnah of the Prophet Muhammad
with the understanding of the early Muslims. The first three generation of Muslims.
So, lets cut this Arab, Pakistani malarchy and see ourselves for who we are, human beings. - Creation of Allah, the Children of Adam Alayhi Salam. And we are all created for one purpose, to worship Allah alone, without associating any partner to Him. And, we are commanded to be good to each other and we must try our best to be like the Prophet and his Companions, May Allah's blessing be upon them all.
Wasalam.