I would run if a renter is being this difficult. Like others have said, if they are this difficult now, chances are they would give you more grief later.
I am local here living on oahu, actually just 5 minutes from Aulani. We bought more DVC points at Aulani when Aulani was announced 6 years ago. Love to book rooms for thanksgiving, christmas and other holidays and you need that 11 month window for the rooms we use. We staycation with the extended family and friends. Many locals also book Aulani for the weekend and holiday staycation.
It is not possible for everyone to be able to leave the islands for a vacation. It's a great substitute for dineyland or disneyworld as it is way more affordable for locals. The cost of flights make travelling prohibitive.
We also stay quiet often at marriott Ko'Olina and it is a wonderful resort. The wife and I actually prefer it here but the young boy likes Aulani every few months for the amenities. I just don't like the cramped feeling of the resort. I would stay there for a few days but for 4 days or more i would rather be at marriott Ko'Olina next door.