雨點落得太敷衍
[yŭ diăn luò dé tài fū yăn]
Translating to 'the raindrops fall too casually/indifferently', this metaphorically expresses dissatisfaction or disappointment with something being insufficiently considered or lacking depth. The author could feel that a response or action was as insubstantial and unempathetic as perfunctorily falling rain.