New Yorkers are, let's say, to the point! But after getting stuck in NYC on 9-11 I'd have to say under the sterotype they are the most caring people. Being invited in to people's homes, offered rides and really looked after as 2, by the afternoon of that day, quite nervous UK tourists - they can do wrong in my eyes.
Now as for people from the UK being rude - well if you think that, you can just £$$£^%@$^@^$£$@%^$£%.