You don't prove a theory by silencing dissent.
The place for “dissent” of a highly useful theory utilized throughout the scientific subject under discussion is not in the High School class room.
In High School Biology class they are there to learn and understand the theories and techniques that Biologists use in their work. Not listen to the ravings of crackpot dissenters who think that the Flintstones was an accurate portrayal of man living contemporaneously with dinosaurs.
You don't disprove a theory by proclaiming it is not science.