I believe that the correct Latin passive periphrastic form in the quoted sentence makes use of the gerundive mode rather than the past participle. . .
"De gustibus non disputandum est."
I also spent 4 wonderful years studying under the Jesuit Fathers. . . no paddles used at my school. . .Father Castellarin -- the head proctor -- much prefer to lift boys by their ears and evaluate cranial resonance in adolescent male subjects by tapping their heads against message boards. . . . a very high end audiophile approach to discipline, of course. Not sure if the study of acoustics under field conditions ever saw formal publication, but it may very well have formed the basis for the recent development of Acoustic Resonators . G.