可笑之人必有可恨之处
[kĕ xiào zhī rén bì yŏu kĕ hèn zhī chŭ]
This nickname 'A Laughter-inducing Person Has a Despicable Side' implies that someone who seems ridiculous or laughable usually has negative, unpleasant qualities. The person might use it to express dissatisfaction with others' behaviors that are both annoying and detestable.