The correct response to someone saying that's not PC is to destroy that person, because they are trying to destroy you... but, we still think that it is good to stay polite in convesation.

I don't think the vast majority of them are even aware. To them, what I said stands, and may be relevant. There is no one size fits all, no method explains it best, etc. We must try many approaches as some reach people, others do not. None of them will reach all the people that another approach might.

Education often fails due to one method fits all approach (though yes there are other problems as well). So too does thinking only one way will explain things fail. It will succeed on some, so does the education approach. One method fits SOME.