I definitely don't prefer small dicks of any ethnicity, but I love Asian porn, and the performers in most of the videos I've seen have above-average to large dicks. The small-dicked Asians probably know better than to apply for that sort of work.
I care about size. Some guys like big tits. Some guys like big dicks. It's just a personal preference, and implies no disrespect to small tits and small dicks.