My grandpa is smart. Like, really smart. He's (self described) the smartest man in the universe. But seriously, he creates Turing-test level AI robots just to pass him the butter. He makes stuff that can easily destroy the planet as a side effect. He travels across space and different realities on a daily basis. He uses his portal gun to come grab me at my school so I'll come with him to adventures. He goes shopping either with his space ship or he sends a robot. You get the idea.
What strikes me as weird is that there are no TV vans in the streets. He barely has face recognition in my school even though he's been there several times with different sci-fi gadgets. He can walk around in the streets, or fly above them with the only space ship on the planet, and no one will be like "hey, there's this really famous genius". The most anyone has ever said about him was "hi isn't your grandpa, like, a scientist?"
It's not like he's shy. We're talking about someone who's turned himself to a teenager once. Who created super intelligent dogs the eventually started a war with humans. He brought all kinds of aliens and AI that the world has never seen before. Not even a morning show special.
How can the smartest man in the universe keep his anonymity?
Looking for a plausible explanation that requires the least amount of ongoing effort from my grandpa. (Can assume a one-time significant effort)