Matter of any kind interacts with radio wave on some level. You might be thinking of how radio waves in the bands and power used for cellular don't have a negative health impact. But they still 100% interact and the human body, being both dense and conductive, absorbs radio waves beautifully.
I think you may have switched the "of" and "on" when you read the original post. They're saying that the human body can negatively affect radio waves, not that radio waves have a negative effect on the human body.
