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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.
As many have stated they vary from 400 -1000 rpm , a lot varies on engine design , true they can idle lower , but the engine runs rougher, many older cars that did not have auto trans an power steering ,an AC , which of course had small 35 amp alt, would idle in the 400 rpm range ,most of the big truck eng use to idle in the 450 - 600 rpm range ,older cars with carbs use to use a step up solenoid that adj the idle do to engine demand, ie the AC cycling on an off , putting the car in gear ...