原谅我口拙不会讨好人心
[yuán liàng wŏ kŏu zhuō bù huì tăo hăo rén xīn]
Translating it into English, it's 'Forgive my poor speaking skills as I do not know how to please people.' It can imply modesty or dissatisfaction with one's own social skills while asking for tolerance from others.