This is an interesting thread.
To me, female beauty cannot be quantified by a bra size or a number on a chart, or a formula. It's the way she smiles. It's the way she crosses her legs. It's the way her eyes twinkle when the light hits her just right, the way she giggles...
So...
I see the affection for large breasts as a fetish more than an innate character trait--i.e., most of us, being objective, would probably prefer to be with a woman who was loving and kind rather than be with a shrewish bitch just because she has big tits--so I assume the same would hold true for small breasts, but I don't really know.
In that respect I definitely am not a "small breasts" fetishist--i.e., I wouldn't seek out for a date or collect pictures of women specifically because they have small, perky breasts....
BUT, some of my favorite celebs and actresses are women like Camilla Belle and Linda Cardellini, and I wouldn't exactly classify them as having "big ones".