While I can see where you're tyring to go with your research, and I generally don't think you should have to defend it since it's your own project, I suspect that people are wary due to the potential for bad science, so to speak.
Personally I can't help but wonder whether your study is based unwittingly on a preconceived notion rooted in your admittedly limited personal experience with the types of films in question, and in particular whether that preconception is possibly based on having simply seen more Asian films than western films featuring such references, and is therefore akin to forcing the facts to fit the hypothesis (the hallmark of junk science, of course).
That certainly doesn't mean it's not an avenue worth pursuing, at least to those who see fit to do so, but the statistics have the
potential to remain debatable, based largely on personal experience, as it appears they will be. I suspect most of us here are at least aware of the depth and breadth of Asian beauty treatments and traditions, but whether they are more prevalent than those of any other country or continent could very well be negligible, and certainly unprovable without mountains of research. Some buy into the standards of beauty, some don't. If you're actually able to produce some interesting and provable statistics out of all of this, then more power to you. But you'll have to watch one heck of a lot of movies, since a good number of fans won't likely be mof much assistance since they probably never paid the phenomena much mind when it popped up on screen in a Hong Kong picture, let alone a picture from anywhere else in the world.
That said, I honestly can't think of any pictures where I've seen the phenomenon on screen, and I've probably seen a couple thousand Hong Kong films!

It was probably there in some of them, alright, but I'm one of the ones who assumes such things to be part and parcel of
most world cultures, and therefore no more represented in one film culture than any other.
Best of luck to you , though!