“become the argument of his own scorn by falling in love.”
自己却谈起恋爱,成了他从前嘲笑的对象。
把「笑别人」和「轮到自己」扣成一句,讽刺干净利落,点题极准。
become the argument of one's own scorn
说某人自打嘴巴、成了自己嘲笑的那种人时用;对本人说会很难堪。
He became the butt of his own joke. / He turned into the thing he mocked.
literary
argument of his 连读,own scorn 两个实词加重。
By buying the same car he became the argument of his own scorn. 他买了同一款车,成了自己从前嘲笑的那种人。
