I go to Maui once a year for windsurfing. Typically, I stay in a '70s condo in north Kehei and drive to the windsurfing spots like Kanaha Beach Park on the north shore. I don't do the resort thing, so I get a stronger exposure to non resort life.
Locals are angry. I really can't blame them. They live in a beautiful state, that's being gentrified and divided up by very wealthy west coasters. Unlike on the mainland, there's only so many places that you can be pushed out of... Understand this, property crime is rampant! Never leave your lodging unlocked and never leave anything unattended 'just for a second'. If you are going to remote places, it's nearly advisable to leave your car unlocked so it won't get broken into. For the locals, it appears that stealing from Haoles (this would be you) is not considered offensive.
There are incidents of Haoles (again, this would be you) getting jumped and badly beaten, and yes these are legitimate racially motivated crimes. Don't let your guard down because you are in Hawaii. If you are in a nice area, you will be fine. If you are leaving a bar at 2:00am and walking through a dark alley to get to your car, be very careful.
I love it there, and have had some great times. I do however get concerned for the 18 year olds that fly in, and want to do the hippie thing and backpack around the islands spreading peace and love.