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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.
Cars that sit an unusually long period of time are likely to develop rust and that includes rust on the rotor. Depending on how severely rusted the rotor has become, it is possible it can be turned and made usable again.