Note, unintentionally -- When an influential voice on HN albeit unintentionally spreads false and damaging innuendo, then says he should not be challenged, what

Note, unintentionally -- When an influential voice on HN albeit unintentionally spreads false and damaging innuendo, then says he should not be challenged, what is the appropriate way to say that, yes, in fact he should be challenged? (His view that I called him a liar does not make it so.)