I would like they understand that the fact that people are born here or there is only a circumstance.
Indeed it certainly is a circumstance!
You want to know in what circumstance my father, hence I, came to be? My grandfather fought in WW1, last survivor of his unit in the battle of Verdun. At the end of the war he was positionned in french-speaking belgium and met my grandmother there and brought her back to France.
Now thats a circumstance that some freshly immigrated african or whatever won't ever have.
Not only does my bloodline make me french, but it is my right as my forefathers fought for the country and built it with their sweat and blood.
I don't like my government, I don't like what my country is becoming. But hell I'm still proud of what I'm born as.
I dislike the argument which goes like "you don't chose the color of your skin, you don't chose where you are born..etc.." because I find it impertinent. I was brought up in my ancestors' country, and I have a particular culture and education that other people don't have.
And don't tell me I could have been born in Africa or whatever because it isn't true. I only exist thanks to my mother and father and their ancestors and their history. I couldn't have been born from other people. I know thats obvious, but sometimes I feel like I need to actually explain this.
(I do see what you mean though... I guess its not my point of view)
edit : oh, and I could give you a huge list of reasons why you can be proud of Spain if you have issues with that. Or catalan country if you prefer.