I can't answer for the classroom (yet), but in the profession there definitely is. I've worked for a plaintiff's firm for the past 2 summers, and their very competent female lawyers are often given a tough time or even badgered by male defense lawyers in depositions.
On top of that, especially in smaller, traditional male-dominated firms, the women have a harder time fitting into "the club."
This isn't to say it can't be done, you just have to be tough. Also, I'd be willing to bet that the situation is a little more relaxed in larger firms and in corporate settings where there are more women and less egos.