原谅我自讨苦吃脑子有病
[yuán liàng wŏ zì tăo kŭ chī năo zi yŏu bìng]
This can be interpreted in two ways: either as sincere reflection asking for understanding because of their mistakes, or self-deprecating humor. In any case, it expresses recognition that they have created some trouble for themselves or act unreasonably, but it's phrased colloquially and bluntly