This is almost certainly not the case any more. It was at one time, but it isn't. Princeton's recent incoming class was more than 60% what they called "persons of color", a term that included all Asians. Among the people who might be called whites, Jews were easily 20-30%. If you start to filter out Catholics, there just aren't that many WASPs at these places anymore. For extra credit, go look up how many WASPs are on the Supreme Court. How many years has it been this way?

The stereotypes just don't fit and haven't for some time.