If he meant LFD Natsu, then he didn't just "bully" base Hades. He also bullied Devil's Eye Hades (with his LFD Crimson Lotus secret art).
But regardless, Natsu at his best was clearly far below Hades. And
Laxus himself outright stated that he "still had ways to go" before even being a match for
Base Hades. If neither were even close to Hades' tier, adding 1 + 1 together isn't going to make a difference, let alone warrant the term "bully".
At most, we can say that Natsu's win was a fluke (more than likely due to plot), but if Hades was bloodlusted with the intent to kill Team Natsu + Laxus from the start, it would've undoubtedly happened.