Ignorance is bliss

It means you don't have to worry about this sort of thing. Apparently people called 'metrosexuals' are under attack by 'hummersexuals'. But it's ok - the hummersexuals will lose because they are not in fact 'retrosexuals':

"Despite his best efforts to convince you, the hummersexual is not retro-sexual. Since when did "regular guys" need several tons of military hardware, or "new macho" lifestyle magazines such as Best Life, or books such as the bestselling Alphabet of Manliness and Men Don't Apologise, to be "regular"? The hummersexual is clearly, hilariously, faux-retrosexual. He's an off-the-peg, drag-king idea of "real" masculinity: stuffed crotch and joke beard included at no extra charge."

I don't understand any of this but it has something to do with a crisis in heterosexual identity:

"Hetrosexuality is in crisis. There is nothing that can be done about it. I'm not even sure what a straight identity might look like."

Isn't "doesn't shag people of the same sex" usually a signifier here? All the other stuff, like one's position on football, cars, the Sound of Music etc. is open to negotiation. Or am I missing something?