Responding to the OP, I wouldn't say the condescension is subtle at all -- it's quite overt among law students. Most think business school is a joke. As some have said above, part of it may be sour grapes -- many people get sick of law school by the end and go on to jobs they really hate. But I don't think that's the whole story.
I'd love to hear comments from current b-schoolers, but my sense is that the academic component of business school really is less rigorous/time-consuming than, for example, law school. However, recruiting adds a tremendous amount of work/pressure and is very time consuming -- you have to go to tons of company events, make yourself known so you get on a closed list, prep for case interviews, and tailor yourself and past WE to some very specific requirements for each industry and function.
Whereas at law school, you just walk right in to an interview, bringing your resume and a smile. Most of what matters is grades and personality. Because recruiting starts at the very beginning of 2L, no one can take specialized courses, so intended field of law doesn't matter at all. And everyone is starting from a clean slate -- WE is largely irrelevant.
So law school may be more academically challenging, but I don't expect to have more free time next year than my wife did 1L/2L years.