Ah, but there are exceptions to this rule! One of the best titles out there is Knitting With Balls by Michael del Vecchio. Sadly, this book is out of print. And I would like to note that throughout the book, the author lets the reader know that knitting is a manly art, that men have knitted through all the ages, though I have to admit that these are some of the gayest patterns I've ever seen.
There are some fun things here, but I'm not sure how many men are going to wear a mohair mobius scarf.
I own a lot of these books that are filled with patterns for men's clothes but are written for women knitters. Erika Knight's Men's Knits; Bruce Weinstein's Knits Men Want, which contains "10 rules every woman should know before knitting for a man," and so on. All written with men's patterns for women knitters.Of course I can ignore the supposed insights into men's psyches, the general rules for what men are looking for in knitted garments (though these are often true), but I think I'd like to be taken seriously as a knitter.
Fortunately, we have some books, like Knitting with Balls, that address the male knitter. Annie Modesitt and Drew Emborsky wrote Men Who Knit & the Dogs Who Love Them, and Kritin Spurkland's The Knitting Man(ual), all are either written for men who knit, or assume a gender neutrality that implies men can knit their own garments. I think it might be time for authors of books for men's patterns to either adopt a gender neutral tone, or to realise that male knitters are ought there, and will not be ignored.