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Jul 23rd 2020!⃝This song is talking about bullies. Bullies often use you to get what they want - and if you don't, they'll knock you down, both physically and emotionally. She is saying that she won't give them money or anything, and won't let their bullying get to her.
The reason why the song is only one line is because there's no need to have more than one line. "Don't bully me. I'm not going to give you money anymore, and I won't run away from you." That's all that needs to be said. There's no need to have a whole conversation about it.