Never been there but I can vouch for the rudeness of Parisiens and as for Manhatten-----
There is a noticable change in atmosphere in Britain as you travel away from London (Or probably any big city)and generally you have to experience it to be aware of it.I visit relatives in the West country and after a day or so it hits me and I realise what a rat race London is.
I never murder people in the West country either.