He didn't say that, he said "there is such a thing as being TOO attached and needing to take a step back and practice a bit of temperance.". I'm asking how much disappointment and anger people need to feel before they finally cut their losses.
Fair enough about what he meant.
But I fundamentally disagree with him about how reality works.
I don't agree that "can get genuinely upset" is "too much". it is the bare minimum needed to have any feelings invested at all.
As for your completely different question of how much is needed to cut their losses... that is a pretty complicated one to answer. it varies a lot by the person, and what in the game upset them.
Personally though I am in favor of low threshold. Be quick to toss games out of your life.
Also something to consider that new people come all the time. Like... someone posting here might very well be a new player that just discovered the game now. Started playing, got upset, and came here to share what us old folks already knew