I'm convinced that this is happening and said as much on the thread to which you refer, TheFabulous.
I was extremely suspicious about a thread started a few days before that poster made that 'Maybe I'll..' statement. Shockingly, it detailed a woman OP having sex without her male partner's consent. I reported both threads and lo and behold, the sex one got deleted with MNHQ stating:
Thread Deleted. Message from MNHQ, poster not genuine.
It's a misuse of the site, isn't within its ethos and any suspicions that it's happening should be reported every time.
What we are talking about are false threads not men looking for genuine advice, but deciding that for some reason, the advice will be more supportive if it's a woman OP.
Personally, I think it's madness to believe that since men and women are socialised so differently, the same advice should be meted out regardless of the poster's sex. Context bloody matters.
But as an antidote to the 'men get a rough' time view, I've also seen posters who would usually be very robust and succinct with a woman poster- sometimes even cruel- change their tone completely if it's a man posting. All of a sudden, they spend ages crafting long posts and if they can criticise the man's girlfriend or wife, they'll be quite vicious about it.