I find it hard to believe anyone would stereotype a whole nation of people based on 1) 16 people chosen from the public for being polarizing and controversial and 2) biased, edited footage that covers a tiny fraction of what goes on between said people.
I don't think any of those things about British people, by the way. If anything, it's easier to judge Americans based on the American BB, because we still have 24/7 live feed so you can get to know the housemates better.