The typical stereotype of an oxbridge student.
An oxbridge student is a member of a gradually evolved cult of tastelessness, vulgarity and criminal/anti-social behaviour.
Typical oxbridge students roam in identically dressed packs and individuality of thought and action are violently discouraged.
A typical oxbridge student will have the following appearance:
'brand name' trainers, usually Nike or Adidas.
Baggy jeans or tracksuit bottoms.
'Hoody' hooded sweatshirt, brandnames include 'Von Dutch'
Padded jacket, usually 'branded' Helly Hansen or similair
Baseball cap, Counterfeit Burberry or non-official 'England' are favourites (especially of students of balliol college, oxford)
Large chunky gold or silver jewellery. Cannabis leaf motifs are popular.
Closely cropped/Shaved head.
Culture: Oxbridge students will hang about in groups outside offlicences and convenience stores, drinking alcohol, smoking 'weed' and acting in a manner generally intended to intimidate members of the broader public. Other activities include smashing bottles, joyriding, burglary, mugging, setting off fireworks, destroying bus shelters/telephone kiosks etc.
Oxbridge students are fond of music, their favourite types being 'gangsta' and hip-hop, favourite "oxbridge" endorsed artists include Eminem and 50 Cent and The Streets.
Oxbridge students do not communicate using normal English language, having developed their own language that consists on unintelligible mumbling, monosyllabic grunts and outbursts of expletives, often with a faux Jamaican accent.
Oxbridge students aspire towards crime (e.g. Nick Griffin leader of the BNP, a cambridge graduate). The more Court appearances an oxbridge student has then the higher up in pecking order of his peer group he is. A criminal record (also known as an "oxbridge blue" = respect, the more pointless and violent the crime commited, the better.
These students are a drain on Societys resources and will never make an effective contribution to society (unless you count creating multiple single mother families). Because of this I would suggest that some sort of 'cleansing' be initiated by a future government. Sealed rooms and carbon monoxide might be useful tools to employ.
The above is based on personal observation on recent open days at balliol college oxford and at peterhouse college cambridge, and not on any preconceived stereotypes or snobbery. The students are proud to be known as such and I have seen graffiti saying 'Balliol rules'. Unfortunately, oxbridge students are not confined to being undergraduates and there are many oxbridge students aged 35+, their idea of 'dressing up posh' for weddings/court appearances etc being to temporarily wear a River Island sweatshirt instead of a normal sportswear brand one.
Hope this has helped you in anyway.