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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.
I have a 1994 Honda Civic. When I start it up at high idle when cold it pulses. Like it goes from 1500 rpm to like 1800 and bounces back and forth. When the cold idle kicks off it can not even idle it just stalls out. When you put it in gear it idles fine at cold idle.