Two years ago, Batwoman's book was just starting and the relationship hadn't developed yet. This wasn't about making a statement; it was a natural progression for the characters that had developed over 20+ issues of story.
The problem is that I think DC doesn't really care about a 20-issue story. The nature of the superhero genre probably means that DC likes to think that they're looking out for what happens 500 issues down the line. The trend over the past 10 years has been to "widen" the opportunities, which means preventing any marriages between characters. They see this as enabling writers to introduce new love interests and storylines that they wouldn't be able to do otherwise. See also:
I dunno if DC just has an aversion to gay marriage, or if they just don't want anything life-changing [and thus, interesting] to happen to their characters. Ever.
Right now, they really love the whole status quo thing. I kind of like continuity, but at times it can be a shackle. I'm guessing that DC watched what happened when Spider-man's marriage disappeared, and when Superman was rebooted so he and Lois weren't married anymore, and they wanted to avoid that if at all possible.
So the real issue isn't that DC is anti-gay, it's that DC wants to impose heavy shackles on its writers so that when they leave the book, things are almost exactly in the same place they found them. They want their titles to constantly be running in place. They may take one step forward, but they will inevitably take one step back and end back on GO.