I would also like to add that it is quite common on the nanny/au pair threads to talk about where they come from and what are the typical characteristics of that country.
Off the top of my head some of the ones with good reputations are: Canada, Poland, Sweden, Australia, New Zealand.
I'm sure others are lovely too. I have had two Polish nannies. One was escorted to the door after about a month of work. And the other was fab and we miss her dearly. So, of course, you are all right that many people with many different views and personalities come from any particular country.
But, generalisations are made all the time by a lot of people.
Some people don't like English au pairs -- not white but English. Does that make them racist? The perception is that English girls have an attitude of superiority, and demand more perks and more pay. And some employers find they aren't actually better than their foreign counterparts.
This stuff comes onto MN all the time.