The Snopes article that made me take notice of this bias was the one letting Clinton off the hook for equating millennials to "basement dwellers" while speaking to wealthy donors during the 2016 election.
Clinton never used the exact sequence of words “basement dwellers”. Clinton absolutely, 100%, used the exact phrase “they are living in their parents’ basement” to describe Sanders supports. If you actually find the text of what she said in that meeting, putting the basements statement in context, it was absolutely dripping with derision. The cherry picked position of asserting that "basement dweller" specifically wasn't used... is fundamentally meaningless, and is exactly the same sort of straw-man you were describing above.
She also said in the very same leak (but curiously not included by Snopes in their article):
“And on the other side, there’s just a deep desire to believe that we can have free college, free healthcare, that what we’ve done hasn’t gone far enough, and that we just need to, you know, go as far as, you know, Scandinavia, whatever that means, and half the people don’t know what that means, but it’s something that they deeply feel.”
There is no way to read that statement without it dripping with condescension. Without full context, what Snopes advanced was patent misrepresentation… and then on top of that to call the “basement dweller” accusation untrue…? Bullshit. It’s “mixed” at best. Any intellectually honest person with full context would recognize her statements for what they were.
[1] https://www.snopes.com/hillary-clintons-basement-dwellers/