Okay, for people who may not get it:
What is being shown here is the exact type of bullying that lots of autistic people (and, in general, people who miss social cues) are subjected to in school. ‘Popular girls’ have a tendency to attempt to befriend their autistic peers for the sake of being their circus freak.
Chelsea in this clip is constantly invading Ruby’s personal space, grabbing at her, and is never not talking down to her. She doesn’t rebuke Ruby’s self-deprecating beliefs (instead opting for a “yeah, you ARE a freak BUT…” approach). Chelsea is literally manipulating Ruby into ditching school in this clip, and we KNOW, based off of other trailers, that she has bad intentions.
Chelsea is a bully pretending to be a friend, and Ruby can’t read her well enough to grasp that Chelsea is treating her like a weird little pet more than a peer. And autistic people who grew up facing this exact type of bullying can see it from a mile away.