That is where you are wrong. Firstly, it does care, because of CAN bus. It need minimal load or it will report a faulty bulb.
Secondly, halogen bulbs even though producing far more heat, emmit that heat as IR energy. They cool themselves by radiating heat away from the filament.
LEDs, even though producing far less geat, do not radiate any IR energy, meaning that all the heat energy remains inside the tiny LED. And since the tiny thermal mass of the LED, it heats up to high temperature. That heat is transmited to the socket.
If you take W5W bulbs for example. They will have a parallel resistor, to mimmic the halogen bulb current consumption, so not to triger the CAN bus error. That resistor alone will disipate a few W of power, and all of that evergy is going into heat, which stays on the resistor. And transfers it to the bulb socket and melts it.