That's a rather ridiculous analogy, it's like claiming that if you drink a whole water tank you will die therefore water is dangerous and you should avoid it. Yeah, Bluetooth and microwave ovens use the same frequency (2.4 ghz), but the similarities end there, wireless devices use very low power, Bluetooth devices are mostly between 1 and 100 milliwatts, while microwave ovens go 700 ~ 1000 watts, meaning BT devices emit at most 0.001% of what an oven does. Dosages must always be taken into consideration.