If korbet is the author:
In this scene Korbet was probably nervous to give his crush Tabby a letter. When Korbet gave his letter to his crush Tabby, She crumpled up his paper (possibly mad at him) and called him a “lugnut”. The author used this scene to show others how he possibly got rejected.
Achilles this is because of the story of Achilles heel which was the weak spot of a demi god that was untouchable in every spot other than the heel.
Answer:
everybody will be happy, won't they?
False allegations on the people behavior you can not judge people according to where the come from