I think part of the problem with this poll is it seems to be asking two questions rolled into one.
1: Do you cross play.
I don't as I like the look of the female toons (I am female) more than the male ones. I have tried male characters and they never seem to last, i just find the way they move and how they look all wrong, even for cats, cows and midgets.
2: Do you like other people cross playing.
It doesn't bother me most of the time, I treat a toon as the gender they are on screen. That said I know several people who cross play, all males playing female toons both in MMORPG and table top RPGs. Mostly they have a mix of male and female characters and it doesn't seem a problem the characters act very similar regardless of gender. However I do know one or two that play exclusively female toons, both in MMORPG and in table top RPGs and I find they are more creepy. So I think it must be not that they cross play, but how they portray the female character, which of cause is more obvious in a table top game than on the computer. The problem seems to be that they believe they understand the female mindset (which even us females will admit is fairly odd and can be very contradictory at times) and end up play a female as they fantasize a female being, which comes out as very artifical and often very cringe worthy and slutty.
I can only speak from my own experiances and it seems that I know far more male gamers than female ones so I have very little experience of females playing male characters, and being female, I am probably not in a good position to say if they can do it well or if we tend to over simplify the male mindset too much.
Before anyone takes offense, this is entirely about people I know personally, not anyone on the forum (or at least I don't think any of the people I'm talking about are on this forum), and is my own personal opinion and I don't have any type of psychology degree either, although I do think it could make a wonderful thesis if you could get honest answers out of people. I think the real question is not about cross playing, its about how well a person really understands someone of the oposite gender and subsequently how they portray them.