Why? Well, probably because Bernie likes his houses in Vermont, and AOC has friends in NYC.
But on the broader topic, I agree that there is a divide between the left wing and the center wing of the Democratic Party in the U.S. Talking with my (Democratic) friend in the Pacific Northwest, the norms of what's acceptable to say in the cities of Washington and Oregon are much more strict than what's acceptable in a reliably Democratic midwestern city. Identity politics being one of the key differences. While stereotyped (and, as Bugfatty300 points out, potentially biased), sendos's list is not all that inaccurate for what my friend describes up there. In the midwest, Democrats tend to be more issues focused than identity politics focused.
I prefer the approach of advocating for equal rights and equal economic opportunities without demonizing the existing side. Call out bad actors, yes, but don't cast entire groups as the problem. Identity politics, IMO, tends to promote tribalization and an "us vs them" mentality, regardless of where it pops up on the political spectrum.