There is a Twitter account called AnonymousQ1776 that tweeted the video with a comment making fun of her, then thousands of people commented saying (basically) that they thought the dancing was cool. It looks like they took the tweet down, because I am scrolling through their timeline and can't find it. I'm pretty sure that viral tweet was the source of the idea that the right were outraged over the dancing video, I haven't seen any other rightwing type say anything about it.
They also help spread the rumor that AOC is not from the Bronx, but I think that mainly comes from Gateway Pundit.