HUH???? Are you saying that idling the engine will cause O2 sensor failure????? Or are you saying that gassing up while that engine is idling will cause O2 sensor failure?????
I am not an expert, but I can't say that I believe any of that. Obviously it is a terrible idea to leave the car runinng while filling up. But to suggest that warming the car up, regardless of whether you are at the gas station or not, will cause imminent O2 sensor failure, is just wrong.
Point me to some official document that says otherwise and I will humbly eat my words.