Is 60°C bad for GPU?

Yes. Idle temp of 60°C is bad. It should be closer to 30-50°C depending on ambient temps/case temps.

Check the other temps in the case. If the cpu looks normal, there's something up with the gpu. If the cpu at idle is also close to 60°C, you have a serious airflow issue or you have the pc sitting on top of the rooms floor heating vents.