I saw “Faust” in Seattle in 1972 with Norman Treigle as Mephistopheles. The Rumanian singer in the role of Faust was so bad he was booed at the Soldier’s Chorus.
You would LOVE my “naughty” lyrics to the Soldiers Chorus, written during the reign of Chirac.
Booing at the Opera is an old tradition that hearkens back to the Golden Age. It is especially effective when a 300 Pound Violetta (or Mimi) is wasting away with consumption!