I'm going to pretend I'm the balanced person here. Non-ionizing radiation is harmful in large quantities. Don't believe that.. put your hand in the microwave.

I know there has been some reports of some police radios causing breast cancer because that's a broadcast strength signal, with encryption, and redundancy, sitting basically right on the breast.

So the issue is that microwave can cause mild tissue damage, which then heals, but some parts of the body are really not built for healing burns. Take cataracts and radar operators for example. That's damage from non ionizing radiation that unlike most of the body doesn't heal.

Now does 5g cross that threshold? I'm not holding my breath but I'm also not going to throw away the claims entirely. It is theoretically possible for something to cross a threshold, but it's also practical that people will complain about it on the internet even if it doesn't.