Turns out, at the launch of the New 52, Aquaman's writer Geoff Johns had absolutely ZERO problem with Mera being referred to as Aquaman's wife (from a Maxim interview with Geoff Johns back when the launch was going on):
You made Aquaman’s wife, Mera, a much more prominent character – how come?
For me, her background is really interesting. She felt very strong to me, her hydroconnect powers are very interesting - controlling the water is visually beautiful and I felt the character was very appealing. That’s why we introduced her in Blackest Night and had her stand on her own before we brought Aquaman in. You know, I think people respond to the character because she is such a strong, confident kickass superhero.
So nice try to make yourselves look non-homophobic, DC, but no cigar.