The wavelength of microwave oven e&m waves is approximately 12.2cm. This is close to the resonant frequency of water molecules, which explains why they work to heat your food.
Bluetooth operates at approx 12.5cm, very close to that of a microwave oven.
Important distinction: microwave ovens output between 600-1200 watts, compared to Bluetooth devices which output less than 1 watt.
Also, Bluetooth e&m waves can’t even ionize molecules given how little energy they emit. ie their wavelength is much larger (approx 500,000 times) than that of visible light which we’re flooded with throughout the day, everyday, and which no one ever worries about.
Only E&m waves having wavelengths shorter than UV waves (below ~10nm) are capable of ionizing molecules and these are of greater concern.
So, no, I personally won’t worry that Bluetooth devices (regardless of which ones) will have any negative affects on my well-being. They are effectively safe.
But as lavar burton would say, don’t just take my word for it. Look into it yourself and don’t stop until you genuinely understand what’s going on. Then, my above points will make sense to you.