I take it that, in that argument, it turned out that the Japanese and Western (American?) audiences were in sync? I've long taken it as a given that those two are liable to have divergent opinions and even general attitudes.
At the time, I didn’t have access to the comments, and it took me a while to figure out how to get them. They're only available on certain apps, which are also region-locked, so you need a VPN. The discussion was about events that had already happened in the manga, and I never went back to see if the opinions aligned since I stopped reading. But recently, someone asked me to check the comments, and for that chapter, the Japanese audience was basically saying the same thing as the Westerners.
I've been doing this for a while, and more often than not, the opinions of the Japanese audience align with those of Western readers. The difference is that Westerners are generally more openly critical, while the Japanese tend to be more restrained. I commented on this the other day, and Nosebleed clarified that it's not that the Japanese aren't critical—it's just that there’s often a bubble of positivity that only bursts when the plot really falls apart.