I don't study at international school.
But, I do have friends studying there.
In my opinion, those who study at international school are from a rich family background.
Some are very arrogant cause they think they're so rich.
And, most of the topics that they talk about are always expensive stuffs etc etc. (Pointing to those arrogant ones)
You're not rich, you have nothing to talk with them. 

Just my opinion from what I see in my friends who study there.
No offence to those who are studying there.    I'm just pointing out some that are arrogant.