Lee is just too dumb to understand such simple things.
Blackbeard diarrhea shat his pants at the idea of he and his entire crew having to fight drunken Kuzan, and now Luffy diarrhea shat his pants at the idea of Kizaru simply being in close proximity to he and his entire crew.
Goda the genius is parrallelling Luffy and Blackbeard, both characters shit themselves at the idea of facing an Admiral with their entire crews helping them!