There's nothing much to criticize about that line; Qian Yuhai quickly switched to the next screenshot.
"Perhaps I should thank Sumant for using Facebook to promote the achievements my research group has just made. But if you have any doubts about the originality of this paper, you should use a plagiarism checker to provide more perfect evidence. That's what respectable people should do, rather than spouting nonsense on Facebook like some riddle master. Of course, I can understand, after all, when your ancestors left the British Isles, they took everything they needed with them, leaving behind only the most basic manners and their forefathers' aristocratic spirit... Oh, my apologies, I was wrong, I almost forgot that there were apparently no aristocrats among those who immigrated to America in that era."
"This shows that Ackerman is feeling guilty; he seems to be trying to change the subject," Zhang Hongcai suddenly interjected with a comment.