I’m not really talking about the challenging. That’s just like duels and having stand-ins so the nobles express discontent while killing other people instead of themselves. It’s more how both houses have ways of proving the butch manliness of their leaders in front of the masses - the #Atreides kill bulls, the #Harkonnens kill captives. Even if the other houses have versions of that, there’s a very specific resemblance between Atreides and Harkonnen.