你若不好拍手叫好
[nĭ ruò bù hăo pāi shŏu jiào hăo]
'拍手' means clapping hands, symbolizing approval and applause. This implies 'if things go badly for you (the other person), I would clap and be happy'. It reflects some vindictiveness or gloating at the misfortune of others, which is usually viewed negatively in many cultural and social contexts.