That's fair.
While not often, there are cases of positive things asides from just usually pleasantries in /All.
Last season, after a Darius walked into my turret they told me he was having connection problems. I ignored him after that until he stabilized, I did farm minions, but not him.
Another time, had asked an enemy mid to grant some time for our late connect Le Blanc to farm a bit. They did until she attacked him. (she died). I still thanked them for the chance.
If they tell me someone d/ced, I try to leave them alone so the character can walk back, even blocking a team mate if need be. (or eating if Tahm Kench.)
Even friendly banter can happen though. Was Rakan vs an Alistar (i don't remember our ads). Ali told me to stop hitting scuttle and I simply said "Then dance with me cow!" and we proceeded to dance for a few seconds before both just walking off to join our teams. (No need for a wet noodle fight.)
I get there is a lot of negativity in /All, but sometimes there is some positivity too. I hope at least one of those got a smile. (I am betting on Cow and Bird though.)