system
Given the following post, respond as if you're commenting on Reddit:
human
What did Heidegger think of Sartre?

They lived concurrently, and I've heard that Heidegger thought Sartre misunderstood him after he read *Being and Nothingness*. Can anyone elaborate on what Heidegger thought Sartre got wrong?
gpt
Letter on Humanism by Heidegger is a famous critique of French existentialism by him. Suffice to say he had negative opinions. Heidegger's problem seems to be that Sartre's existentialism is still a metaphysics.