I'd like to know where this comment would stand if you had instead said 'IMO most female authors are a waste of my time', while complaining about sexism in the same post.

It is not sexist to point out percentile trends and averages that you have observed.

Lets compare several fantasy categories on amazon to see.

edit: this is in direct order from rank 1 below in popularity.

Hot new releases in Fantasy:

Female:

1 http://www.amazon.com/Claimed-Alphas-Part-Viola-Rivard-ebook/dp/B00JC9HGIE/ref=zg_bsnr_16190_1

2 http://www.amazon.com/Night-Broken-Mercy-Thompson-Novel-ebook/dp/B00DMCV7WS/ref=zg_bsnr_16190_2

3 http://www.amazon.com/Shade-Vampire-Gate-Night-ebook/dp/B00IY3GO7S/ref=zg_bsnr_16190_3

4 http://www.amazon.com/Six-Months-Seven-Series-2-ebook/dp/B00J7WZW2I/ref=zg_bsnr_16190_4

5 http://www.amazon.com/Braving-Elements-Darkness-K-F-Breene-ebook/dp/B00J4UERNI/ref=zg_bsnr_16190_5

Male

1 http://www.amazon.com/Skin-Game-Novel-Dresden-Files/dp/B00JDQ7X8O/ref=zg_bsnr_16190_8

2 http://www.amazon.com/Thirst-Vengeance-The-Ashes-Saga-ebook/dp/B00IXEPZM8/ref=zg_bsnr_16190_9

3 http://www.amazon.com/Raising-Steam-Discworld-Terry-Pratchett-ebook/dp/B00FIN0TGY/ref=zg_bsnr_16190_19

4 http://www.amazon.com/Kingdom-Keepers-VII-Ridley-Pearson-ebook/dp/B00CB5CTR4/ref=zg_bsnr_16190_27

5 http://www.amazon.com/Master-Mage-Reawakening-Saga-Jackson-ebook/dp/B00JHGA7HO/ref=zg_bsnr_16190_30

Sci fi and fantasy > 4 stars and up > fantasy

Female:

1. http://www.amazon.com/Night-Broken-Mercy-Thompson-Novel-ebook/dp/B00DI7HMG2/ref=sr_1_4?s=books&ie=UTF8&qid=1396752984&sr=1-4
   
   
2. http://www.amazon.com/Undead-Pool-Kim-Harrison-ebook/dp/B00I2GZTVY/ref=sr_1_11?s=books&ie=UTF8&qid=1396752984&sr=1-11
   
   
3. http://www.amazon.com/Outlander-Bonus-Content-Diana-Gabaldon-ebook/dp/B005E87VRS/ref=sr_1_13?s=books&ie=UTF8&qid=1396753076&sr=1-13
   
   
4. http://www.amazon.com/Shadow-Night-All-Souls-Trilogy-ebook/dp/B008071KCM/ref=sr_1_37?s=books&ie=UTF8&qid=1396753168&sr=1-37
   
   
5. http://www.amazon.com/Interpreter-Maladies-Jhumpa-Lahiri-ebook/dp/B00I7JO14M/ref=sr_1_45?s=books&ie=UTF8&qid=1396753168&sr=1-45
   
   Male
   
   
6. AGOT
   
   
7. Words of radiance
   
   
8. Raising steam (discworld)
   
   
9. LOTR + Hobbit
   
   
10. Invasion of the overworld : a minecraft novel
    
    fantasy > magic and swords
    
    11 of the top 100 are female authors (3 mention romance in their synopsis)
    
    So, if I had to choose a fantasy book at random (from the source that 90% of us get their books) , would it be sexist to say I'd probably get a romance heavy story from a woman, and a blood and thunder from a guy?