FWIW, I’m Japanese, and I was born in Hawaii and lived there until last year.
I’m going to say that it depends on who you’re talking about. Hawaii has a decent part of its population made up of mainland transplants, and many, many families have relatives that live on the mainland. So you can’t say that Hawaii is hostile towards mainlanders or that Hawaii folk are against living on the mainland.
Still, there are segments of the population that are less than friendly towards mainlanders and Caucasians in general. You can, with reasonable accuracy, identify these segments by location, hence the remark about Waianae (which has a large Native Hawaiian population, many of whom are homeless). It’s mainly a matter of cultural identity and independance, rather than outright racism. Generally, among those with Native Hawaiian blood, the feelings of animosity stems mostly from what they know of the overthrow of the Hawaiian government. There is the feeling that Native Hawaiians are as they are today (generally less educated, poorer, and less healthy) because of the way white American culture changed Hawaii. There aren’t burnings of effigies of white people, and there aren’t any hate crimes against Caucasians. But you will hear some strong remarks about the white settlers who came to Hawaii in the 1800s from the more vocal Hawaiian independence proponents.
Then again, Native Hawaiians don’t make up much of the present population of Hawaii, so their feelings aren’t really representative of Hawaii as a whole. The last time I checked (and I admit this might have been as long as 5-10 years ago), Japanese, Chinese, and Koreans made up about 60% of the population. Native Hawaiians were around 15%, and as Hawaiian blood has become so diluted, a good number of those could have called themselves Chinese or Samoan and it wouldn’t have been any less accurate.
I never detected an outright hostile sentiment towards mainlanders. Instead, the feeling is that in Hawaii, things are just different. Hawaii is smaller, therefore more closely knit. Hawaii is friendlier and more laid back. Hawaii doesn’t have all of the problems that the mainland does. And so on. And the perceptions of the differences between Hawaii and the mainland aren’t always negative. For example, there is the perception that mainland people speak well, speak out more, and are better educated. I also think people in Hawaii tend to perceive mainlanders as being financially well off, or at least better off than they are.
As for Waianae, well, it’s worse than other parts of the island, but it’s not as though there are roving gangs of 500lb Hawaiians looking for white tourists to beat up. Heck, my ex-boyfriend, who works as a male nurse and is a total sweetheart, lives there. But then again, I always thought it would be funny if a tourist mistook Waianae for Waialae. Two very different neighborhoods, they are.
Seriously, though, you shouldn’t be on any beach alone at night.