I'm copying & pasting a quick reading taken from my beloved encyclopedic Wikipedia and here it goes...:
In the notes that appear in the album Via Paolo Fabbri 43, Guccini writes: “I am a storyteller (not in the 'historical' sense of the term) and (…) I tell, through myself, what I do and what I see, and I should not be called a poet or anything else.
A bit like what I say in L’Avvelenata (…) but in a different, ironic (I hope) and grotesque way; and I hope that the friend I mention in the song doesn’t hold it against me for leaving his name.
After an afternoon of chatting and mutual clarifications, I hope to have become friendly enough with him to be able to make fun of him.
And then when we met, the song was finished; he listened to it, and it didn’t seem to me that he got angry.”
The music critic Guccini refers to is Riccardo Bertoncelli, who in a lengthy article in 1998 recounted the story in detail.
Bertoncelli, in 1975, was a very young collaborator for the magazine Gong, where he was asked to write a review of Stanze di vita quotidiana.
It was a ruthless critique, and more than twenty years later, Bertoncelli would say: “It was a vice of the time to teach artists what they should do, rather, who they should be, and I fell for it with the Leninist zeal of a Red Guard.”
A few months later, Bertoncelli learns that Guccini had sung a song in concert that mentioned him; then he reads in another music magazine that Guccini said about him, “he’s someone who doesn’t understand anything (…) one of those who still writes Amerika with a k.”
So he calls him, and they decide to meet.
They spend an evening together at Guccini's house, discover they have common interests, that perhaps Guccini hadn’t sold out to the record companies, and that perhaps Bertoncelli understood something.
During that evening, Guccini picks up the guitar and plays L’Avvelenata for him, and offers to remove the name from the song.
Bertoncelli refuses: “Now that we’ve met, it doesn’t make sense anymore.”
Guccini tells him that he has no intention of recording it anyway: it's a concert outburst, not a song to put on an album.
But it's a song that the audience loves, and a few months later it will end up on "VPF43"
L'Avvelenata (F. Guccini) - Casabase Notte Playlist