Self-selection bias. The Asian American community is immensely diverse and consists of many different immigrant (and native!) waves. Wealthy, well-educated Taiwanese semiconductor engineers from the '70s and '80s are not the same as LA Korean grocers are not the same as Vietnamese boat people are not the same as Hmong refugees are not the same as recent mainland Chinese nouveau riche are not the same as Nisei and Sansei who have been in the U.S. for decades are not the same as Pacific Islanders or South Asians or Middle Easterners.