Have lived all over the world and any trouble coming from the expat desi community was 90% of the time Pakistanis (unlike the Indians and Bangladeshis who usually remain low key) and mostly its against other Pakistanis.
In the UAE, whether it be The Shopping Festival, Eid Mela at the Consulate, or any other function you were bound to find a couple of Pakistani "gangs" fighting it out against each other for one trivial reason or another.
When I went to study medicine in Romania which was only the third year since they had started the English program there were already a few gangs established and the main reason was that juniors didn't call the seniors "bhai". I had a very such confrontation on my first day there in an Arab restaurant asking me to call them bhai but they backed off when they saw I was with the Arabs and were fearful of Iraqi owner actually had a sword behind the counter and had chased one of these wannabes around the campus before.
They even hired tigans (gypsies) for 50 dollars (which was a couple of months salary there back in the day) to stab each other (other students that is). And these were all medical students.
When I was in London for a couple of years it was also full of these chavs assembling in their respective neighborhood parks and harassing every and any unknown desi looking person. The hilarious part was that they were all skinny wannabes with those slits in the eyebrows and the lines in the hair and would have run off at the first sign of actual conflict if they were not in a group.
Less said about what I saw in Pakistan, the better.
