From what I can google up, congruency can have different meanings? Is this as response in a dicussion to say "I do not believe you?"
closed as off-topic by green_ideas, Hot Licks, MetaEd Nov 15 '17 at 16:52
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what you say does not follow the pattern of reason or rhyme beforehand.
"congruent" means "In agreement" or "in harmony" and can only really be applied to two or more things.
So, unless "you" refers to two or more people, this sentence, “What you say is not congruent” doesn't really make sense. It sounds like an example of magniloquence - using unnecessarily "flowery" or complicated language. In other words, I think the speaker is somewhere on a spectrum between pretentious and simply wrong.