Like most of what the others had said, I find nothing wrong with cross-gender roleplayers, especially since I do it myself from time to time.
However, there is ONE major pet peeve I have, whenever it comes to both roleplaying or just being out of character:
Gender-related misspellings or mistakes. For example, if you did a typo with the words "he" and "she", a lot of people become incredibly offended and STAY mad even if you told them it was a typo.
This pet peeve of mine REALLY rubs me the wrong way, especially whenever cross-gender roleplayers are involved. To put my horrid karma in a nutshell:
Many times when I /used/ to roleplay, I would come across cross-gender roleplayers. Most of them are just any average person, like me, since I am a cross-gender roleplayer too. However, there's always that situation whenever you "mistook" someone for the wrong gender and they're pissed at you. Say, if I was talking to a male character that's IN-CHARACTER, I would refer to them as male when OOC by default. However, if they are actually female (or a male playing a female character), I get a BUNCH of hateful text.
Well I guess I'm sorry for getting the wrong gender because you PLAY that gender? /steaming/
Whelp, there's a little rant and two cents. Now before anyone shows any fangs, I'm not saying all of them do this, because again, I am a cross-gender roleplayer, and these experiences are completely due to my HORRIBLE karma.