I think he was mostly poking fun to be honest. He comes off as far more of an asshole here than he usually does in interviews.
This is pretty much how I'd read Batman, too. In a lot of older and more martial cultures, your domestic, romantic, and/or marital life weren't considered as central to your existence as your role on the battlefield and your relationships to your comrades in arms. Old epics have a bunch of examples of male warriors forming extremely close friendships with one another, which often get played up to what seems like an extreme degree to modern eyes (we're the culture that created the term "bromance" as a thing; we've still got some weird hang-ups about how close male friendships are supposed to be).
A lot of pulp heroes, Batman included, are sort of throwbacks to this kind of attitude. So it puts them out of step with the heroes that take the more modern attitude towards living (find job, find partner, have kids), and just happen to moonlight as a vigilante.
So is he trying to say that anyone who chooses to put his career first is gay?
"Sh - no - brick"
I think people need to stop treating every single thing Grant Morrison says about superheroes as some sort of gospel that needs to be parsed out at length. A) It's not nearly as important as the actual stories he writes; and B) the man is getting very tiresome.
Grant is just fucking with people. That's not obvious?
But I think when you look at how many bromances he's in and how they're deeper than his relations with women, the gay argument begins to crystalize.
I see people at Bleeding Cool blaming Adam West and Wertham for the Batman/Robin thing...
But Batman and Robin were sharing a bed and showers together for years before that.
And it's not pedophelia because, on a symbolic level, Batman is an adolescent boy like Robin is.
Batman is thematically a Yaoi franchise.
On a literal level, yes, he's heterosexual and Robin is his son figure. On an archetypal/psychoanalytic/magical level, Batman is a total Yaoi franchise about adolescent boys' love for one another.
To me, Batman is all about a little boy trying to make the world *fair* and settling for trying to make it just.
His best villains reflect this, as Joker is all about unfairness, but then the Riddler plays "fair" but he beats Batman at it, and Two-Face is at war with justice within himself.
I'm not sure I'd characterize his trappings as any more or less "gay" than any other superhero.
I'll crosspost what I said on Robot 6 and say that while I think there's an argument to be made that there's a homoerotic undercurrent in superhero comics in general, his specific points about Batman are pretty trite.
(we're on Tumblr too!)
I think his takes on Superman and Wonder Woman are spot on. I also agree that his take on Batman seems more tongue in cheek. It is kind of interesting that if you look at Wonder Woman's history, how often has she owned her sexuality? Or even been sexual? I feel like Gail was starting to introduce some of that when she was employing her Amazonian courting ritual, but there has always been, at least since Marston, something extremely virginal about the character. Virgin Mary meets Mary Tyler Moore does describe a long stretch of her history.
With Wonder Woman, I kinda feel that Power Girl -- particularly the Palmiotti/Connor take -- usurps her role as a brassy, funny alpha female. The kind of woman who could tell dirty jokes and challenge people to arm wrestle.
Even though that take ended decades before I was born, I feel like it resonates with me more and you see it, albeit less comical, in the Cooke Wonder Woman.
I would love it if Wonder Woman was the one person in the JLA who had a mouth like a sailor. (Hal's the closest but he's an uptight flyboy who uses a forced show of bravado.) Maybe in terms of a modernized take, closer to Marvel's Hercules.
I think it'd be great if every third line out of Diana's mouth had to be bleeped.