Do you (or: do people usually) exclude Madrid from Castilla? That's the only place in Spain I've lived and would not class the people I knew as quiet and calm. But then again it's a melting pot of people from all over Spain, so who knows!
And the calmest and quietest people I met were from the east coast :D
Totally. I think to them it represents and demonstrates liberation, freedom, fun, family and community. Loud means fun to them.
People complaining about noise are seen as serious party-poopers.