I think it's really interesting. I do wonder how much of it is just feedback loops - even though I couldn't care less about the gender of the author, I think most of the books I've read were written by men (even though my favourite author is Robin Hobb). Therefore, when I recommend books to people I'm stuck with a list that is male-dominated, and the cycle repeats itself.
The question is: where does that bias begin? Publishing houses (either in submission acceptance - which according to statistics isn't true - or in marketing budgets)? Subconscious prejudice? From what discussions I've read, a major part of the problem is that there are fewer women writing fantasy - and that's another thing that reinforces the feedback loop.
You make a really good point. But there's no easy answer, much to my dismay. As you pointed out, we read primarily from our own gender. (Having a hard time finding that list on here but it's recent.) And as you might point to later, there are 10:1 males on this forum. This certain "traditional fantasy" blogosphere we work in is dominated primarily by males. As JL said, if we were to look at Fantasy as a whole, it would be dominated by women. Question is, why don't we show that? (And frankly JL, the second you stuck "My personal experience" in as a help, I tuned the statistics out. Least you didn't use Amazon!
Because we care about either "Epic Male Fantasy" "Pulpy romps such as UF or S&S that don't have PR or YA in them" or "Progressive New Weird that focuses on gender and race, predominately pushed by women." (See big names like Kameron Hurley, Ann Leckie, NK Jemisin, or well, Saladin Ahmed, but when's the last time he put out a book? 3 years.)
Raptori also stated that there wasn't a bias in publishing house submissions, but in actuality, there is. Problem is, it's purported not by the gatekeepers but by the subs themselves. Little over a year old so apologies, but it is done by one of the Big Five.
As that shows, there is a big skew in "Historical/Epic/High Fantasy" "Horror" and "Science Fiction" toward male submissions. UF and PR is actually split down the middle, but how many PR by men can we name off the top of our heads? As for YA, surprise surprise, it's dominated by women.
Still, not all fault lies here. As you said, there is a feedback loop bias. I'm not a fan of that blame however. I read what I want and recommend thusly. I happen to enjoy pulpy S&S or Epic Male Fantasy, then that's probably what I'll recommend. Go to a YA forum that's probably dominated by JK Rowling, Suzanne Collins, Sarah J Maas, Kristin Cashore, Cinda Williams Chima, and Eoin Colfer. Does that make them sexist? I see no outcry there. (Nor with Romance, but that's an entirely different conversation.
I keep telling people Fantasy as a whole isn't sexist. If you're going to include the Big F, you need to lump in ALL sub-genres. Now, is Epic/High/Pulpy Fantasy (the one that gets the most "recognition" around here) skewed toward males? Absolutely.
I also note this is only a piece to the puzzle of "Is there a Bias in Fantasy?" answer.