Rather a strange discussion topic. The stereotype of the UK is the opposite, that people in the North are more friendly than those in the South. Well, when people say 'people from the South' what they tend to mean is people from London. But generalisations like this are a bit silly, you get friendly people and unfriendly people all over the country.

Jajajaja, de tópico nada, es más bien un hecho Juani, por lo menos aquí en España los andaluces somos unos cachondos, jajajajaja. Un saludo.

Nowadays people here are not so friendly but elder people are really kind. But according to your question people who live in the south of a country are a little more friendly than thoes who live in the north. Actually it might not completely true.

All countries in the planet? I cann't imagine that