*sigh*
I think that's particularly true of undergrads. Who go straight from home and good A-level results into a community of 2-500 other undergrads. Wherein everything is parochial. Everything is pastoral. Everything is shaped. Birthdays are celebrated by going to Formal (i.e. put on your suit, go into a big hall, have a three-course meal, get moderately drunk, everyone is frightfully nice, £50k of silver out on the tables). Skater subcultures are virtually non-existent. There are no goths. Drugs - if present - are often well hidden. Alcohol is socially respectable. The nightlife (in Cam) is awful.
And... everything is parochial. Closed off. Limited. You are At This Wonderful August Institution. You Must Buy Into It. There Are No Options. The Walls Are Close. Your Friends Are Within These Walls. They Go To Formals...
And it ends up being a shaping and filtering process... people have too much to lose by not wearing the suits. By not buying into the 'undergraduate family' they're assigned, consisting of two older 'parents' and two new 'children'. By dressing like a skater. By being visibly bombed on phet. And if something looks Wrong... or Non-Conformist (In An Unsafe Way...) then you've instantly got a personal tutor, a director of studies, a college dean, a college nurse, possibly a college counsellor, and a college head of pastoral services (along with intense monitoring of wellbeing by peers) ALL waiting to have an informal chat, and make sure everything's ok...
Ironically, the most prim, proper, formulaic and Shaped Cambridge people I've met have been those who've come from the roughest London / Glasgow estates and who've been through the full Cam undergrad system...
IMO there's also a lot more diversity and freedom in grads. Who have a bit more time and space to develop. And who know that not buying into a claustrophobic social system won't be the end of the world - and who consequently have more of a chance to take it or leave it.
But, yeah... I don't think it's so much 'as long as you don't rock the boat'... I think it's more that the shaping and... informal pressures... are so intense that very few people are likely to.