I dunno, I don't really watch Anderson Cooper or anything but he just struck me as neutral. Like, he could've gone either way as far as I knew.
Totally-out-of-left-field coming outs don't happen because there's a reason they'd be totally out of left field. I mean let's face it, gay dudes don't exactly masquerade as macho, gay-hating straight dudes too often. And it's a lot harder for people who don't appear to be gay to come out as gay.