Yeah, I know what you mean! I never got that either, but I think being 'Spanish' is more of a term regarding the language than the ethnicity or the nationality. We all speak Spanish so it's okay to call ourselves 'Spanish', even though many of us are, technically, not really Spanish.
Then again in my case is a bit different because my parents are Spanish; they're Spaniards that just happened to move to Chile and had me there XD
Well, at least cultural confusion does not occur as much in homogeneous countries. If you go to Chile and ask someone what they are they will say, 'I'm Chilean', whereas here in America they'll go, 'Well, I'm Irish/German/Scottish/English blah blah blah.' Seriously they could just say 'I'm American'; there's been so much mixage in here I think no one's a 100% something in here.
Re: Maker of #4, Spanish Culture & Mixage 101 (tl;dr Ahead)
Then again in my case is a bit different because my parents are Spanish; they're Spaniards that just happened to move to Chile and had me there XD
Well, at least cultural confusion does not occur as much in homogeneous countries. If you go to Chile and ask someone what they are they will say, 'I'm Chilean', whereas here in America they'll go, 'Well, I'm Irish/German/Scottish/English blah blah blah.' Seriously they could just say 'I'm American'; there's been so much mixage in here I think no one's a 100% something in here.