The look on Jasper's face when Steven tells her off along with the Crystal Gems, though:
That was something else. We've practically
never seen her looking this hurt or heartbroken before. This even puts her expression around the ending of Earthlings to shame. That's genuine sadness and pain, right there. And she feels it because she finally found someone she could respect and follow. Someone she pledge allegiance to and aid now that the Diamonds' Era is over and the truth of Pink Diamond is out, because she's one of the only active Gems left who still believes in the old ways of Homeworld. And just when she thought she finally found her new purpose, Steven tells her she can't help him and just tells her to go do something better with her life for once. She was utterly
rejected by the one person she thought had given her a purpose again, and it happened mere moments after she had seemingly found that purpose, no less.
For as quick as it was, this was a damn powerful scene.