I think part of the issue here is that I still don't know what a "reply guy" is. I'd never heard the term until the large influx of users during Twitter Muskopocalypse.
I had the impression that a reply guy was someone unconnected to the original poster who shows up in replies and acts like they belong there, which hits a nerve because that's exactly the behavior that enabled me to make friends on Fedi.
But your phrase "drive by" that makes me think you mean something else?