It lacks the laidbackness of the south and they're very Northern Europhile -- they show too much love to the Brits and Danes. They're said to be extremely racist and they might even have lynchins in the country. Segregation is said to exist in places like Prussia and Holstein. I wouldn't go there.
Probably about the same amount as northern Germany.
There are no places in the world free from bigotry.
Everywhere has hatred, and it must be battled against daily.
Even on this site, people irrationally hate entire nations based on ignorance and misconceptions.
It's a sad state of affairs.
But no, north Germany is not entirely racist.