I am Asian. I have a small dick (a touch under 5"). Honestly, I take that much offense to the stereotype. I'm certainly not proud of it, but I have a feeling it might be true.
I don't KNOW that it's true, but based on the dicks I've seen in public showers and from what I've heard from my Asian girlfriends, it doesn't seem out of the question. In general, Asians have smaller tits. In general, Asians are in shorter. In general, Asians have less body hair. In general, they have fewer curves and flatter asses. Of course there are exceptions to all those, but isn't it conceivable that, in general, we might also have shorter ding dongs?
Certainly there's evidence that people cite that says all races have the same dick size, but then I've seen inconsistent data from survey to survey. Until I see a study performed with some semblance of academic rigor, I'm taking everything with a grain of salt.
The OP is an incompetent boob for seriously thinking that there might be NO large Asian cocks out there, but there's a possibility that the average is smaller, and I think it's odd that so many (I'm assuming non-Asian) people dismiss that possibility on account of political correctness and flawed data.