I don't think we should underestimate still the pressure of being "normal" - although I tend to assume most men I work with are gay unless I know otherwise, I know enough not to underestimate the difficulties of coming out and staying out. I'm straight - I don't have to "explain" my sexuality, or hide it, or excuse it, or tell people about it. Gay men & lesbians still have to do this everyday.
I also think that sexual preference is not necessarily something you can put in a box and fix. I'm sure we all know men & women whose preferences shift. I think that current liberal groovy beliefs are rather more fixed in being "cool" - one only has to look at Shakespeare's plays to see that fluidity in sexual preference is as old as people. And to accept that is far "cooler" and more progressive, than putting people in fixed boxes. [see also: cool progressive thinking about gender roles ad infinitum]
On the other hand, yes, Spacey has deflected the accusation of abuse with his public coming out.
But it's interesting that the widespread harassment & abuse of women is being sidelined by the prospect of gay male child abuse. Homophobia & misogyny all there in one go.
So actually, in this case, I think Owen Jones has a point.
Although I don't agree with the 'outing' movement - but iirc, it was at its height during the AIDS crisis, when gay men & activists argued that powerful closeted gay men staying closeted added to the lack of understanding and nasty homophobic panic about AIDS. [See Tony Kushner's Angels in America for a sense of the feel of those times].
Although on that topic, the gay activist movement's sense that no-one cared about gay men dying of AIDS is not borne out by subsequent events: research on HIV/AIDS boomed - far more than research on typical "women's diseases." Plus ça change and all that.