People keep making this argument, but it doesn't hold water. Moana is the main character, and there's a Moana costume that no one seems to be making a fuss about. Lilo & Stitch came out and no one cared that there was no David costume. I don't think the Maui costume was meant to be offensive, but I highly doubt Disney would've faced criticism if they didn't release it. After all, The Jungle Book was the third-biggest movie this year domestically. Show me the outrage or cries of racism over there being no Mowgli costume for sale.
By all means, please tell me the point of saying, "It's like some white people in the internet tell other white people what is racist," and what it has to do with Polynesians saying the costume is insensitive. By making it about white people, you're completely dismissing the concerns that some actual Polynesians do have. You can disagree with those concerns (I do, to an extent), but there are some people here who seem to think that it's only an issue because of "white people," which is just as presumptuous as thinking all Polynesians should be offended.
Again, the problem is people constantly using "white people being offended on the behalf of minorities" as an excuse to dismiss the issue outright. Those posts show more concern over what other "white people" think than they do about what Polynesians think.
To turn around someone else's saying, "'This isn't culturally insensitive and offensive,' said the White person who never bothered asking the opinion of a Polynesian."