There seems to be a strong tendency to assume that erveyone is like the speaker. It's especially funny when friends of mine mention something like that (everyone is non-religious everyone is super liberal) not yet realizing that I don't fit the bill :-) Stanford actually has very strong religious student groups.
Very much not true if my experiences of living in Berkeley in the 90's are anything to go by (possibly my definition of "rare" is different since I'm from the UK).