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Luca's retardation is explainable. His mom made him live a sheltered life, which is why he knows nothing about food or care, he didn't grow up around anime deeper than what's on Netflix so he doesn't know about that much weeb shit (or vtuber shit). However he was midway through a STEM degree. You can be retarded in one part in life, and smart in another. Plus his mom is insane and controlled a lot of his life hence the conditioner -> shampoo thing, he tried to do it the other way and was surprised at how soft his hair was
He isn't actually that retarded, just sheltered. Plus he didn't talk to nerdy people, he was a jock in school who picked fights outside of stores with cunts who looked at his friends funny.