He
IS talking about Lee's Blood. He is refering to his blood as awful and Sasuke's as delicious. He went all the way to their training as well to confront Sasuke.
It does, as Lee outright admits his jealously of Sasuke's lineage and that Sasuke can move and exploit Sharingan without getting affected by Tunnel Vision. If this isn't admission, then I don't know what is:
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This gives Sasuke far more maneuverability in Taijutsu - something which Lee cannot afford, and he admits it. Thread proven.