Considering how many ENORMOUS klokateers there are in mordhaus (like 7 feet) I imagine 09, a guy of average height, yelling at recruits nearly twice as tall as him or something. OH YOU'RE TIRED ALREADY LITTLE FELLA? TOO BAD, 30 MORE PUSH UPS
Well, he's not too harsh, but he's not very patient either. He can't stand it when people moan or do stuff half-assed way, therefore he's very strict and demanding.
This is a coping mechanism. Even if you think you "used him for his body" it doesn't create any emotional or social devastation for him. Men weren't raised like that. It means nothing to him. At the end of the day he goes online or into male chat groups and says "i fucked her".