I wouldn't. I've considered making up a gender generic name for myself with no avatar so no one would know that I was female and then I thought about it more and asked myself if I had any real reasoning behind doing it.
I thought about it. I didn't have any real reason. The only reason I could think of was that it would be interesting to see if people treated me any differently. I realized that they probably wouldn't. At least not 99% of the folks.
Then I realized I really had no reason to set up another account.
If you set up a "non" nice guy handle, what would you intend to do? Be mean, rude and otherwise different to people? Is it worth it, though?
Belive me, there are days when I just want to write pages long rants about various things, but I'm glad I don't, because I think I'd regret it afterwards. I know I regret a few of the things I've posted on other web boards that don't have such strict "play nice" policies.
My thoughts are different on some days too. So I know what it's like, but really, I think the trouble it would cause you in the long run, it's not worth it.
Not to mention it would confuse the heck out of us
