Wow. I knew the guys behind DC's answer to marvel's hugely successful cinematic universe didn't know what the fuck they were doing. It's common ground as a movie fan, actually. An awful lot of film trends can be summed up as a huge hit coming out and people struggling to get in on that success. The only difference here is that this time it's between two particular long standing rival companies in their fields. Which only magnifies the effect, as I can't be assed to look up the actual numbers right now (it's quarter to midnight in the UK), but I'll bet that marvel's comics have seen some increased popularity since their avengers movie continuity hit it big, increased popularity that may well hurt DC, if nothing else, simply because it's a cash cow they're not quite in on.
But...seriously? This guy mangles a beloved character like this in what is effectively a public setting like it's no big deal. I don't even know that much about martian manhunter, my only prolonged contact with the character was "injustice: gods among us" in which he was a DLC character, and thus not even in the plot that much, but even I seem to know more about this character than Goyer does. It wouldn't surprise me if shit like this leaked, I practically expect this kind of talk behind the scenes on DC productions, but to just say "Yeah, I'm gonna shit on this character if I get the chance, what of it" like that? It doesn't just show that he doesn't know what he's talking about, but that he doesn't care that he doesn't know what he's talking about.