To be pedantic, I will come with a shorter answer to your statement.
Not if white stepped on the deeper end of the blunder 
Not sure how this issue concluded, but such occurrences makes me sad.
I used to promote Go, and among other benefits I was mentioning that Go makes us better. Not in only intellectually, but socially too. Unfortunately, I see that this is not always the case. So often we forget to look at the whole board, and stubbornly cling to a half point ko. One representative example was that transatlantic game when the loser got the point due internet lag. Sure, in the heat of the game you may miss the right way. But later with a clear head, the right way should be obvious, no debate necessary.
I played 1001 games in March, and there were plenty situations like this when I have won lost games, with an endgame blunder of my opponent. And here is the fine line between right and wrong. All those games were blitz. No time to count, hence I saw no rudeness on not resigning.
Seeing this game, my opinion shifted few times because of this fine line.
First I considered that black is in his right to play till the end, the difference being not so huge to spot it in a blitz game at almost ddk level. But I had a blitz set mind.
Then I noticed that the game is correspondence. And I considered that black was rude to pursue that path. At this moment with my mushy brain (actually struggling to beat 8 kyus) I have spotted that sequence instantly. What I felt that is OK for me to do in blitz, I felt that is not to do in correspondence, That damn fine line. But then I saw white passing once, passing twice, and now I felt white being one of two, rude, for not concluding the game with an in territory defense, or not strong enough to deserve the win, not seeing the sequence, even black made it very clear that it has an intention there filling the neutral points.
Yes, the situation is complicated by the fact that white can give away the upper stones and win, and the fact that the upper atari is a lot stronger give away, than filling the dame. But still, as Go players we should know to give away stones when we can spare. We should know some hand talk. Black is not at all in the wrong here. Yes, like me, he is maybe weaker in the opening and middle game, but better in yose. And filling that dame he actually said… OK, I see you are better, you are a lot ahead. But you saw that? And if white saw it, should have said, I saw it, and defend it. And the game would have ended without friction. I have no idea what was in the whites head. Maybe for real, fed up by stallers he thought that this is stalling. And not for a second thought that there is some aji needed to be defended. But when things escalated he should have looked and see the black point of view. Maybe the truth is more complex than that and I am curious about it. I am really curious how white can defend his stance. I am curious about what I may be missing here.
And I remember a similar situation happened long time ago. It was me, the eternal 4 kyu, and other club member beating at the mighty gates of shodan level. I have never defeated him at parity. And in that particular game I had a moment of clarity. I saw a very complicated sequence. But only worked if there were two more black stones. I already had about 5 stones in huge white territory. No chance in the world that I can survive there at normal play. But I moved there. He looked carefully, did not saw nothing and tenukied, increasing his already decisive advantage. I placed the second stone there. he looked again carefully. He is a cautious player and never rushes, like I often do. Sure, the move was pointless, no chance yet for my group to survive. So he continued with other big end game move. And I placed the third stone. Now my scheme was working. But it was complex. He answered that move because was forced, and a tenuki was not acceptable,. but still he did not saw that he lost. I strike at the second aji, Also, forced answer, and he sees what I have saw ten moves earlier. He counts, sees that he is few shorts points behind, resigns and congratulates me.
And now decades later wee are still friends. Imagine that he will have reacted like white here. For good reason I have wasting his time. those two moves were absolutely pointless. But he respected my level of play (believing that I am hallucinating) and continued to increase his advantage, actually disrespecting my true ability. With a little more respect he would have defended, since his advantage was enough already, and I would have resigned.
So you see, sometimes we need to step a little back, give other some space.
If not, tensions will gather and crumble the cards castle in which we live…
