Why do a lot of Americans hate Russians ?

Older Americans probably remember the Cold War days when the Russians that defected to the US tended to be intellectuals. The younger Americans (not just white ones, btw) have been more exposed to the Russian lower classes and some of the Russian crime syndicates that control whole neighborhoods of certain cities. Hence they have a different view of Russians. Mexicans have the same problem. Americans only see the poorer, less educated ones migrating in so they aren't really aware that there are middle class intellectuals in Mexico.