The first rule of gun culture is don’t talk about gun culture
I cannot fathom how anyone can mistake such comments as evidence of civilized behavior.
Given that the US is affected by gun-related violence unlike essentially any other developed nation, it's completely reasonable to bring the American gun fetish up anytime there's a shooting, to draw attention to it and to (hopefully) enact change which can prevent these kinds of tragedies in the future.
The only winning move is not to play.
My apologies for the failure on my end.