I partially agree with that, i know personally exposure to different cultures and races has technically made me more racist, but only because the more exposure you have to something the more patterns you recognize.

I live in Australia which is a very big multicultural country, and for the most part the original immigrants(Asia major), Mediterranean,maoris/white kiwis, white south africans and english/irish/scottish etc are pretty much a staple of Australian culture where it's really not an event to meet someone from those countries.

However, Lebanese, Arab and north africans, are becoming a problem in the country and people are becoming hostile towards them.

We have a joke in australia "Did you hear the Lebanese boxing team pulled out of the olympics? they found out they had to fight one on one" which is of course directed towards the propensity to get into an altercation with one, and suddenly you have twenty on you.

I think exposure works partially in that it eliminates irrational fears, i completely agree with you on that, however i think exposure to some cultures and people actually creates rational fears when there is a problem with a certain group of people and no one will talk about it for fear of being called a racist.

it's a very interesting topic i'll give you that much haha.