FWIW, it's not a myth that "EV's catch fire", the myth is that they catch fire at a higher rate than ICE powered cars. But OTOH, what also isn't a myth is that when (some)[1] EV's do catch fire, they tend to be harder fires to extinguish (eg, it takes a lot more water and time to cool them sufficiently to avoid spontaneous re-ignition), compared to ICE cars. So there is sort-of a legit "thing" about EV's and fire.

[1]: I'm thinking of Tesla's in particular. And this is not speculation, in the official Tesla emergency response guide they discuss how much water/time is required to fully extinguish a Tesla fire. And as a former firefighter, I can say with no qualms that those numbers are higher than that of a traditional ICE powered car (assuming we're not talking about a large cargo truck, fuel tanker, or some other extraordinary case). Not sure to what extent EV's from other manufacturers share this same characteristic.