There must be one reason why he is uninterested and is probably the same reason why you think that he is smart enough to give classes to those critics, he must be seeing that it is a completely and huge waste of time.
The quality of one debate will normally be decided by the quality of the words of the less skilled speaker, if you argue with someone not so smart or dumb then the quality of the debate will be almost childish, if not worse.
However, if he did find a man or woman with enough culture i'm sure that he would totally do it if there is a good reason to do so. If it's another teacher it would probably be better. Otherwise, why wasting time doing it?