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.
Cometh the hour, cometh the Binface…
Support and friendship for those whose lives have been affected by estrangement.
Do we get too much ‘weather forecasting’?
(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.