That's more of a minority in my opinion, my father lived in Kona, I'm from Oahu, whole family is Hawaiian (pretty rare thing nowadays). Yes, Hawaii was pretty much invaded, but younger people (I'm 30 ish) like myself are I guess, over it, or to me, I saw it as a good thing because I don't have to live off the ocean and built grass huts like my ancestors did. Just my opinion, anyway...
Anyway, just in terms of behavior, just don't be overly obnoxious and arrogant about anything. Its those tourists that get on the locals (and myself) nerves, but if your open and kind to people, you'll be alright. I think that applies to anywhere though, it's just that Hawaii gets a lot of tourists so a lot of obnoxious vacationers have passed through and annoyed "us".