These are all very good posts. Over the years, I have heard women speak ill of other women in very catty and bitchy ways, if they don't like other women. With the exception of very effeminate men, I have found that men will typically avoid each other, if they don't like one another.
In one of the other departments in the building where the department of German, my department, is located, there exists a department to remain nameless. In that department, there is a woman, who does the work of 2 to 3 people; yet, she will never be promoted, because she is so catty to other women. Incidentally, no other department will hire her for that same reason.