Why did dwarfs argue with C.S. Lewis?

In the first volume of ‘The Chronicles of Narnia’ the goblins, whose archetypes were the dwarfs, served horrid White Witch. The dwarfs didn’t have a clue why the author of ‘The Chronicles of Narnia’ hated them so much but they decided to take a revenge.

They started pissing to beer so that it became completely sour. At the same time the gnomes living at Lewis’ house let diverse pest to infest the whole flat.

In the end Lewis gave up and he came incognito to Wrocław, Poland to negotiate with Papa Dwarf. After this meeting the dwarfs stopped disturbing him. The gnomes also changed their attitude and became much better creatures in the following volumes of ‘The Chronicles of Narnia’.