I was in vacation in Mexico 4 years ago. In a few places I identified myself as a Spaniard thinking it'll be easier for the locals to talk to me in Spanish instead of English (stupid me) and got only rudeness. Since those experiences I only spoke English and said I was American, what a difference!! Even the books they have at the hotel rooms talked awful about Spaniards.
How many Mexicans do you know live in Spain? They're all here in the U.S. Obviously there's a reason for them to do that. Yes, they hate us, and no, they don't look up to us.
All I can say is, it's a pity that for something that happened 500 years ago and we (actual Spaniards) have nothing to do with it, we get this kind of treatment. Get over it, I don't hate Moorish for invading Spain in the 700s!