I wasn’t the one to claim that, and neither was the person who opposed you, from all I could see.

There’s just not enough research/calculation done on drones vs. fireworks, and a lot has to be taken into consideration. How often are the drones used? Are they recycled at the end of life? Which materials are used in their production, and what is their source of energy? etc. etc.

The advantage of fireworks is that they are very simple and use little materials to produce, most of which are safe (but some are not great).

Drones, on the other hand, require a lot of lithium and cadmium, as well as other basic resources like metal/plastic, silicon etc., and some parts of their manufacturing involve high-end facilities that require a lot of resources to maintain correct conditions. All of this leads to high footprint of their manufacturing, and if you use such drone just a few times for some large-scale swarms and then forget about it for a while, this will get way less ecological than fireworks.

Don’t get me wrong, the technology is good and drones can absolutely be a superior option. But this heavily depends on how they’re used.