It's difficult to convince others of the incorrectness of their misconceptions. But lets try:
Cell phones, wifi, microwave ovens... All harmless rays of super weak "not even light" rays.
radiation is a scary word, but light is also a form of radiation and it is much more powerful than mere microwaves
microvawe ovens put out 1000W of weak, non-ionizing radiation.
The sun also puts out 1000 W of far more powerful radiation:
"At the upper reaches of our atmosphere, the energy density of solar radiation is approximately 1,368 W/m2 (watts per square meter). At the Earth's surface, the energy density is reduced to approximately 1,000 W/m2"
Oh, and a good, properly shielded microwave oven keeps all of its radiation contained inside it. (no leaks) The sun is not shielded. 1000W right in your face! (per one square meter)
Relevant video: https://www.youtube.com/watch?v=CQrDSCo83mk