I unironically think this is a serious societal problem, and we need to come to consensus around it. 

I think I agree with the last guy in the first screenshot, just default to fist bump, it's the lowest common denominator.

At ranged weapon distance, display your weapon hand raised to shoulder level or higher, fully open. Move it from side to side for additional visibility if range merits.

At melee distance, extend your open weapon hand outwards and await your counterpart to do the same. Clasp hands for a final confirmation that neither party is armed, which serves as a proxy for an absence of hostile intent.

Take it as an opportunity to size up the strength and resolve of your counterpart by giving his hand a firm squeeze and a slight vertical shake.

If someone comes at you with a closed fist, assume hostile intent from an armed opponent. Proactively eviscerate him and, if it's not a bountiful season, eat his corpse.

maybe covid made fist bump the default shift? less touchy

planting causal loops; harvesting reflexivity

I will not eat the bugs, I will not sleep in the pods, I will not recast my fellow human beings as a universal threat tainted with inherent biological original sin