He wasn't even aware of the fact that the same could be said of his fellow party members with regards to his blanket criticisms.
Examples (Wiktionary)
Mandarin
共产党员在和友党友军发生关系的时候，应该坚持团结抗日的立场，坚持统一战线的纲领，成为实行抗战任务的模范；应该言必信，行必果，不傲慢，诚心诚意地和友党友军商量问题，协同工作，成为统一战线中各党相互关系的模范。
共產黨員在和友黨友軍發生關係的時候，應該堅持團結抗日的立場，堅持統一戰線的綱領，成為實行抗戰任務的模範；應該言必信，行必果，不傲慢，誠心誠意地和友黨友軍商量問題，協同工作，成為統一戰線中各黨相互關係的模範。
gòng chǎn dǎng yuán zài hé yǒu dǎng yǒu jūn fā shēng guān xì de shí hou ， yīng gāi jiān chí tuán jié kàng rì de lì chǎng ， jiān chí tǒng yī zhàn xiàn de gāng lǐng ， chéng wéi shí xíng kàng zhàn rèn wù de mó fàn ； yīng gāi yán bì xìn ， xíng bì guǒ ， bù ào màn ， chéng xīn chéng yì de hé yǒu dǎng yǒu jūn shāng liang wèn tí ， xié tóng gōng zuò ， chéng wéi tǒng yī zhàn xiàn zhōng gè dǎng xiāng hù guān xì de mó fàn ．
In their relations with friendly parties and armies, Communists should take a firm stand of unity for resistance to Japan, uphold the programme of the united front and set an example in carrying out the tasks of resistance; they should be true in word and resolute in deed, free from arrogance and sincere in consulting and co-operating with the friendly parties and armies, and they should be models in inter-party relations within the united front.