In the video (which is complete bullshit and anyone who watches it and sympathizes with the filmmakers can just fuck the hell right off), a couple of guys trick a girl to prove that when she claims she has a boyfriend, she doesn’t actually have a boyfriend. What a bitch, amirite?
No. She’s just not interested. But she’s probably learned that if she says “I’m not interested,” the answer could likely be “why not?”
At that point, she has to lie and come up with some nice way to tell the guy he seems kind of sleazy and makes her feel unsafe or she can tell him the truth. She’ll probably lie because when most of us are confronted with the choice of telling someone they are a sleaze or telling them something slightly nicer, we’ll go the nicer route.
Also, she’s probably learned that if she tells him that he is sleazy and makes her feel unsafe, he could ask her why she thinks that and then call her a “cunt” or a “bitch” or “frigid” and say she deserves to get raped.
Here’s the sad part, though, for the girl in this video, no answer is OK. If she says he’s kind of sleazy (because he is) and she isn’t interested, she’s a bitch. If she lies to be nice or just to avoid a more unpleasant conversation that she doesn’t want to have because fuck him she’s trying to study and he should have just left her the fuck alone, she’s still a bitch because she lied!