Why do you expect it from Noia - a GC player whose team is barely competing in Tier 2 - but not Shanks who has played briefly at the top level? I guess Noia's experiences are more recent, but Shanks did play pro-level Valorant. As for Sideshow, he dogged on KC in 2023 quite a lot and he was a consistent doubter of Paper Rex.
Unfortunately, watchparty streamers flame players and teams quite often because it is how they can engagement bait or clip farm. I personally think this is one of the more annoying types of clips since it's more fun to appreciate quality plays. Noia might be flaming Bang the most because he has a high potential and he was simply out of it completely.