Sartre is one philosopher from one movement (Existentialism). "Academic philosophy" also doesn't really mean anything. The two main schools of thought in academic Western philosophy are analytical and continental. They have essentially nothing to do with each other. Sartre is associated more with continentals, but this is an anachronistic association. Even then, he is one thinker among thousands.

This is akin to eating a potato, disliking it, and swearing off all vegetables.