@Sung-Sun Well in my opinion, I think you should tell them to stop arguing about it, its a useless argument really but tell them they have their own opinion about those littlest things and everybody is different so you shouldn't change the other people mindsets. If they actually enjoyed their arguments then just ignore them, its their problem not yours, if you can't stand it just continue to ignore it if you don't want to argue with them
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Damn, this is a long useless message