Personally I think males and females alike are confusing, difficult and hard to read. I think that it mostly has to do with a lack of communication. You really have to master communication and body language in order to handle both sexes. I don't think it's that women are necessarily worse than men in this aspect, just that women tend to talk about it more than men.
I really cannot stand when I have to repeat myself. Like if someone asks me what my schedule is like and I tell them...then a week later they ask me again even though I expressly told them that my days off do not change. It makes me feel like they weren't listening in the first place, and that's upsetting.