It's ok to tell your kid f you. I mean really, they f us all the time with their lies, their manipulations, their stealing from us financially and emotionally daily, weekly, monthly yearly. They give us the big ole F you finger. I told my son last year he was piece of sh*t. He was because of what he said to someone about the death of their kids in a fire. Oh man, did he ever come unglued at me telling him that. Honestly, I felt so much better telling him that finally. I have no regrets.