Radio waves are attenuated by human tissue depending on their frequency but I would be surprised if one person's body produced a total cut off. I have noticed one door in our house that seems to weaken the signal if closed and of course WiFi doesn't necessarily penetrate equally well to all corners of a house because of attenuation by walls, especially solid ones.
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ALPHABETICAL FOOD AND DRINK (Jan 26)
(not sure what his superhero name would be? No-computer man?) However, he might have a mobile phone in his pocket which has Bluetooth switched on. Sometimes that can cause a Wifi signal to drop.