Mostly because white people’s experience with living in areas with large Asian populations is negligible. They only think about the tiny amount in their own community who own the local take out or convenience store. East and South Asians often look down on us pale people and anyone who sees what happens when east or south Asians take over a school district know the challenges.
As a group, Asians think white people are comparatively lazy and stupid.
With some justification.