This tendency is very well known in other regions of Spain, and by many, not considered very polite. Although it is kind of hillarious at times.
Just to give you an idea...
Instead of dude, they say jackass, penis, or vagina.
If you're mildly upset, you'll probably scream cunt.
If someone gets a good grade, you'll congratulate him by calling him a son of a bitch.
It's very typical here, and though I think it's funny, a lot of Spaniards outside of the area think the Gaditanos are rude because they speak very dirty. And it's EVERYbody. A three year old girl scream at her friends for being a gilipollas whilst her grandmother tells Zapatero to go to carajo.
A warning; it's really catchy...
If I insult you when I come back, be comforted by the fact that'll be in a language you don't understand.