Viewers that actively read the chat are fuckin' weeeeeird. Same for streamers that get super hung up on the constant maintenance of their public chat's "culture" to the exclusion of all else, especially if they are accepting raids and aren't in sub-only mode.
The chat feed is there for the streamer to do crowd work with and feed off of for content, it's going to be moving way the fuck too fast for a viewer to follow for nearly any streamer that's getting into 4-view territory. If there's a regular chat message you don't like, even spam, literally wait 2 seconds and it will be like it never happened. Acknowledging trolling or "calling it out" as undesirable is choosing to feed into the behavior you are trying to dissuade.