expression
always contradicting; saying the opposite
Describes a person who habitually takes the opposite stance, often just to be contrary. Used as a set phrase describing a contradictory personality.
彼は右と言えば左で、何でも反対する。
He's always contradicting—whatever you say, he says the opposite.
あの人は右と言えば左だ
That person is so contrary that you can't have a discussion with them.