Like most buzzwords, gaslight has lost its meaning.
Gaslighting is convincing someone that they perceived or remembered things incorrectly. That's a very specific kind of manipulation.
The silver lining here is that the world has gained an extremely compelling argument for regulations.
Shipping is essentially fan fiction. It's fine as long as nobody takes anything too seriously.
Don't take too long trying to figure out a challenge by yourself. Ask questions. Unlike in school, you are allowed to ask for help with your work.
Learn how to write unit testable code as soon as possible (SOLID principles). Learn how to write concise and relevant unit tests. If it's not in your team's culture to write unit tests, then you go be that guy. It's good for you and it's good for the product. Unit tests are one of the few things in the programming community that everybody believes are a good thing.
I find that it's good to ask questions that allow them to vent further.