I fully agree with you, but one could argue that Obama did well among Asians due to his Hawaiian and Indonesian upbringing and lifelong connection to that community including his half sister who I believe has the last name of Ng.
Outside of Hawaii, I doubt that played that much of a role. Gore and Kerry IIRC did reasonably well with Asians.
I believe the two main reasons are: a) the us vs. them mentality of the GOP (even if the GOP isn't especially anti-Asian), which alienates all groups that aren't like the stereotypical Republican (even explaining why pre-Obama blacks were overwhelmingly Dem despite some social conservatism) and b) anti-intellectualism of the GOP and high educational attainment of Asians.
