He didn't intend to tattle, nor did he have any intention of blaming Lin Chuxia, but... perhaps Gu Yuheng didn't realize that what he did at the time was indeed "tattling."
The elders immediately pulled Lin Chuxia aside and scolded her harshly, complaining that she shouldn't have made such a big deal over a mere two dishes.
Even more suffocating, however, was that while the elders were chastising Lin Chuxia, Gu Yuheng stood by nodding in agreement, "Exactly, her temper is too big, she needs to change."
Lin Chuxia's nose was crooked with anger on the spot, and she ignored him for over a month afterwards.
...
Gu Jiu had no idea why Gu Yuheng would act so childishly.
His Third Master didn't usually care much about his dietary desires; how did he end up butting heads with the young mistress over food?
Now look what's happened, the relationship that was hardly mended has plummeted back to freezing point.