像个疯子一般边哭边笑像个植物一般不痛不痒
[xiàng gè fēng zi yī bān biān kū biān xiào xiàng gè zhí wù yī bān bù tòng bù yăng]
The phrase translates into 'Laughing and crying like a madman, being indifferent like a plant'. Perhaps they use such extreme contrasts and paradoxes to express mixed feelings they're having or to suggest they can experience intense emotions but do not care much about them in daily life.