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a gnome's idiotic love for an elf

Can anyone tell me where Tolkien mentions, in The Hobbit, the idiotic, or any other kind of love, of a gnome for an elf? Where does he even write about the character Tauriel?
And that's sad. The Lord of the Rings gained its widespread popularity through its respectful treatment of the original text of a classic.
Now it's all becoming pop culture, like Vikings versus aliens.
I won't go; the first film was enough for me.