The grass is always greener on the other side. New York is one of the Rudest Parts of the World

It's all down to where you are and what people you come across. Much like in the UK.
That's odd, when I hit New York everyone was uber nice, just everybody.
We got a lift from one closing bar to a strip club from the designated driver of the group. We'd been talking to them for hours in one bar and decided the night wasn't over. The first night there we ended up in a bar just off time square, still stupidly cheap to drink in compared to here, talked with loads of people, everyone was friendly, went to a "dive" of a bar, on the way stopped to get cigarette's. Some weird manky old whore approached us and some other guy who over here you'd instantly be wary off came over and talked her into leaving us alone, was bizarre. Gave us an idea what bars would be open, walked us over to one as it was a darkish street at like 3am. Drank for a while in that bar where we met a woman who did makeup in porn, so had many many questions for her
THere are places in London I would not want to walk around at 11pm, let alone 3am. From everything you hear about New York this was a road, that was empty, dark and seemed a bit, well a good place to get mugged. But after several days there, I felt safe everywhere at all times, something I don't in many parts of London. Considering how New York's been portrayed over the years I was frankly shocked at how safe I felt there.
New York was just bumping into one nice group of helpful people to another, though I felt nervous when bumping into people who here you'd see a group walking down the street at 2am and be worried they'd start something, they ended up being incredibly nice and helpful.
Have been to other places aswell and there is the slightly false(compared to here) happy face on people who work in say Denny's and most food places. But when you realise everyone else not working for tips acts the same way you know even if they are playing it up, its not much.
Honestly I think people are just happier over there, they are more open because they are less worried about how people think of them, they are more confident, happy, willing to start a conversation. Here we just have that gloomy feel to almost everyone. Until the drinking starts people seem very reluctant to talk to new people here.
The USA has big gang problems, but unlike chavs who you can really encounter anywhere at any time. Gangs really do tend to stay in the ghetto's, unless you go hang out in Compton you really aren't likely to see any gang related problems at all. Here its not isolated to only certain area's, its a growing culture thats really spread out everywhere.
I'm not sure the USA is better, less holidays, but then more likely in many places to be at a workplace with friendlier nicer people. Maybe 1 weeks less holiday a year but 50 weeks in a friendlier happier atmosphere more than makes up for that?