I'm just middle aged and lost all energy for unproductive discussions. The second another poster posts something genuinely hostile, like "touch grass" kinda shit, I'm just done talking. Also if we're six comments in and the other guy won't even admit to being wrong to the thing he said on comment one, despite me doing twenty minutes of research to prove conclusively that he's wrong, I don't want to waste another second of my life on him.
I gotta have 10% of the "disengage" comments on this site.
Okay but I've seen as many examples of people using it as a "have the last word spell" than as a way to tell someone who's legit been pestering you to fuck off.
I'm pretty sure spamming someone with replies after they've asked you to stop is against the rules anyway so you could just report them.