Um. I suppose that some other food-eating behavior is also signaling, but I don't think that the majority if non-organic food eaters are doing it because they conceive of themselves as people who don't eat organic food and want to show off that fact. And I'm rather suspicious of the idea that not eating a selection of foods is signaling as a general rule. Like, someone could eat Italian food as a form of signaling (especially if they themselves identify as Italian) but someone who doesn't eat Italian food is probably not doing it because they think of themselves as someone who "doesn't eat Italian" and wants to signal that fact.

I suppose there are probably people out there who don't eat organic as a way of showing affiliation, but I don't think that encompasses any significant portion of those people who do not eat organic food.