I don't know where in Canada you've lived, but there is plenty of that in Toronto, and Calgary, especially dealing with the natives. I'll bet Montreal and Vancouver aren't must different.
There was no culture shock moving from Canada to the US.
The situation with natives is a far cry from the systematic and pervasive problems with racism against African Americans in the US. Natives are such a small percentage of the population in Canada, and certainly in urban centres, that no especially abusive laws have been constantly set up over the years in order to keep them at what is considered the appropriate station in society. Think of the hundred years of Jim Crow laws in the US, and the even current attempt to disenfranchise them during every election through voter registration laws and voter list deletions. It is simply not comparable.
There was no culture shock moving from Canada to the US.