Why are suburban high schools more cliquey then inner city ones?

[thetruenorth]

Im in grade 12 and I used to go to a highschool in the suburbs and was often a target of bullies and I also noticed that there tends to be well defined social groups. Also there is a fair amount of fighting and what not.Most of the popular guys act so full of themselves and act like such choches. They drive BMWs,Hummers etc. to school and are always posting fb pics of partying and **** and showing themselves off etc. They act like they are superior to everyone and try to pick fights over small stuff etc.
Well this year I transfered to a different high school. Its in an older section of the city. Its not like a ghetto or anything but its not out in the suburbs.
Well ive noticed that its not really that cliquey at alll. Like yeah people have their groups but they arnt caught up in the whole idea of cliques. I find that evryone in my senior class seems to at least get along even if they arnt best friends. Also the "popular" guys (like the ones that play alot of sports etc.) don't act like choches and they talk to everyone else too.
I have found it very easy to fit in and stuff and talk to people. I have always been introverted in the past and never had many friends at all at my old school and was picked on. Seriously wish id left way earlier.
But what do you think is the reason for this. Is what i described unique to my situation? or are subburban hgih schools just more cliquey then inner city ones. Why is that? Also my new highschool is more racially diverse. Could that play a role? I mean you d think that would make it more cliquey but it really doesnt seem too.