It's not that Seaborg disliked Harvey, but after a couple of combat drops with the 2nd Platoon one got the sense that if you didn't like things to explode unnecessarily around you, you would want to stay well clear of Daniel Harvey.
In "The Ghost Brigades" by John Scalzi, the relationship between Seaborg and Harvey is complex. While Seaborg does not harbor any personal animosity towards Harvey, his experiences during combat have led him to be wary of Harvey's presence. After several intense situations with the 2nd Platoon, it becomes clear that Harvey's actions often result in chaos and explosions, which can be dangerous for those around him.
This creates an atmosphere where one might prefer to avoid getting too close to Harvey in combat scenarios. Seaborg's perspective highlights the unpredictability that comes with Harvey’s reckless behavior, emphasizing a need for caution in a high-stakes environment where safety is paramount.