It's rude to make jokes about Greta Thunberg.
Gerald is a middle aged man.
Gerald wants to point out Greta Thunberg to his teenaged daughter.
Gerald says he hopes his daughter is as confident and outspoke as Greta Thunberg on things that are important to her.
Gerald tells his teen daughter he hopes she won't be as loud and obnoxious as Greta Thunberg.
Gerald is a good father and his daughter is confident and feels heard by him.
Gerald looks like a jerk bullying a kid and his daughter feels insecure.