I got angry and said something hurtful about a girl in a movie while looking out my window. She was at her gate with her sister, who was filming me. I didn’t say her name, but I’m worried it might be defamation. Is this true, and what can I do to defend myself?

It’s possible your words could be considered defamation, even if you didn’t name the girl directly. The sister filming you could strengthen the case. You should seek legal advice from a lawyer to understand the specific laws and potential defenses in your situation.