At yesterday’s matinee Hansel and Gretel at the Met (broadcast and simulcast), a disgruntled audience member expresses his distaste for the “forest” setting, just as Lisette Oropesa makes her entrance as the Dew Fairy. Top marks to Ms. Oropesa not only for singing her solo so enchantingly, but for continuing without a flinch despite the clearly audible shout of “Boo! Change the set!” (At least the fellow didn’t yell, “Bravo! Bravo Robert O’Hearn!”)