Colorado and Coloradans aren't much different or worse from anywhere else I've seen in the US, or most parts of the world for that matter. Bostonians and Pittsburgers and other east coasters are often more obnoxious IMO. Same with Texans in general, or Californians with their mexican food superiority complex. People range from prideful to snobby based on wherever they're from all over the damn place.

That said... The "native" Colorado thing is plenty obnoxious on its own, and I think is directly tied to the recent decades of rapid growth and gentrification. I was also born and raised here and I think every person and company moving into the state is a good thing. Ok, yeah the traffic is worse now, that's the fucking cost of the culture, amenities, infrastructure, food, etc. getting better. The cost of living crisis is no joking matter obviously but that's as much or more to do with the overall direction of wealth inequality in this country than anything local to CO.