So.. okay, opening a discussion or something here:
I've had a number of occassions where a Social Fight occurred with one or more Alien Race Pawn that had an additional type of melee attack. With very nasty results.
It *seems* that most if not all Alien Races do have the default "Human" attack, according to the injury tab. However they also make use of thier additional "unarmed" weapons.

I don't know if this is how the "rules of engagement" work for Social Fighting (They don't seem to make use of Melee weapons) but the results are often perhaps unintentionally more serious than the mechanic is meant to cause. Such as severed limbs.
I'm pretty sure I have never had Chuck Norris as a Pawn in Rimworld.

To me it appears Social Fighting in the vanilla game was not intended to include anything other than Human-ish pawns, so this may not be a fixable thing. Or perhaps I am totally misunderstanding the "Social Fighting" concept itself.

I am reminded of the "Friendly" Brawling in Skyrim. Khajiit effectively always have an Iron (Or was it steel?) Dagger in thier claw-attack, so it is very easy to win a "friendly" brawl. Because there was no other option for them to use. It was just the way the code was set up.