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Letting your car idle isn't actively bad for the drive train, but it certainly does put strain on the engine, additionally engaging the AC will put the engine under load, and work the engine harder even though you're not driving anywhere.
My truck has been idling low when coming to a stop, almost to the point of stalling out. In researching, I've found that when jumping a vehicle and restarting the ECU, you're supposed to let your vehicle idle for 5-10 minutes so that the computer can learn the idle.