Smaller versions of this already exist, it's called a photonic fence and is used to wipe out mosquitoes in flight using a scanning laser to ID the species and sex of a ufo, then a more powerful laser to either flat out burn specific targets to death or just incinerate the wings and effectively cripple things.

The main problems with the photonic fence are that the places which need it don't have the infrastructure to power it, and the units get stolen otherwise 🙄

Obviously the scales involved there are negligible to humans beyond the aspects of disease vector control, but the basic premise of a DE system using IFF, identification friend or foe, is there. Meaning if you have drone vs drone swarms you can pick off only the ones you want, most simply done by considering uniform, mass produced models vs everything else.