Greenland was also under direct US occupation in living memory, still has the northernmost US military base in the world, and is notably located on the same continent as 49 of the 50 US states — with its Kalaallit natives being closely related to several Indigenous groups of the USA's biggest state, the USA's biggest neighbor-slash-puppet, and even the easternmost region of Russia. Even if you had only ever looked at the very first picture at the top of the Wikipedia article for "Indigenous peoples of the Americas", you would've seen that Greenland is overwhelmingly Indigenous.

...Now I really shouldn't get so ticked off about it, since obviously everyone's going to be ignorant about some things, but I really can't help but feel like when even such superficial prodding into Arctic or Indigenous history and issues as even just looking at a map of pre-contact language families, would've revealed that Greenland is an Inuit country — that you probably haven't been doing your due work to learn your own continent's history. So if it was just one person with that misconception, I don't think I would be so bothered by it, but it was several people, which might point to this being a broader issue.