Contour Enthusiasts Group Archives Forums General General Turning on the AC at 45Mph or more

Last week I was in my friend's car in the highway. He forgot to turn on the AC and we were like at 50 Mph, so he move off the highway to brake, and then he turned on the AC.
That was too exaggerated for me, but he said that turning on the AC in high speeds can damage the motor.

Is this true? Or it doesn't affect it at all.