1. When she was DTF and not subtle about it at all.
2. When she reminded this idiot of her title.
3. When she said being a man was a birth defect.
What makes it badass: She not only answered Jim's question efficiently, but she also made him shut the fuck up.
4. When she gave zero fucks about other people's judgment.
5. When Stella reminded Tom of what a hostile world women have to live in because of how men behave.
What makes it badass: Stella, without raising her voice or explicitly calling Tom an idiot, was able to tell a little story that proved he's an idiot.