It will also give you cancer in 1.5 seconds!
Wow, really? Please tell me you posted that from a 56k dial-up modem because "phones lines are safer" or some such similar ridiculousness.
If he did, yes he would be safer.
Plants and people have been shown to absorb the radio signals that wi-fi emits & scientists are divided over whether this is enough to cause damage to tissue. Researchers in Holland found that trees exposed to wireless radio signals suffered from damaged bark and dying leaves.
There is little evidence, however, that wireless emissions pose any danger to human health. Wi-fi signals use very low intensity radio waves, 100,000 times less powerful than a microwave. So sitting in a wi-fi hotspot for a year would only expose you to the same dose of radio waves as making a 20-minute mobile phone call.
So by making fun of someone who might have jokingly exaggerated the effects of wifi, you and the other guest made fools of yourselves by showing your utter ignorance of the existence of this important trade-off that Apple, Samsung and Co., and all consumers whether consciously or otherwise decided to do.
So let us have this civil debate or you GTFO.