I thought I might play a tiny bit of the devil's advocate here. There's one instance in which I think the "I like ..." might not be so horrible.
In recent years, the supposedly ideal female form has been unhealthily underweight, with just no outside limit on how little is little enough. Unhealthy equalling dead, in far too many cases.
Men rejecting that paradigm of female attractiveness is actually a good thing. Young women in particular could benefit by hearing it. And hell, it might even apply to small boobs -- since the self-mutilation women engage in to achieve large boobs can be as plain unhealthy, physically, as starving themselves.
It's just that rejecting the paradigms takes a whole lot more than posting "but I like ..." on internet boards, or even in real life. It takes walking the walk. Not just saying it and demonstrating the opposite at ever turn: ogling women on the street who represent the big-boobed, semi-starved ideal (how many men ogle small-breated or chubby women?), participating in the porn industry that thrives on the unnatural body forms, participating in any public or private discourse that approves of those unnatural forms and/or disapproves of any of the range of natural ones.
Rejecting it in mainstream popular culture is a little harder. But maybe actually speak out against advertisers that model women this way, that sort of thing.
The thing being, it really isn't all about them and what they like; it's about women, and what's important isn't a man or men's approval of particular women's body types, it's rejection of the whole idea that men's approval of how women look is what women need to put uppermost in their minds.