Well, Reality Warping is diferent from Dream World shenanigans. That falls more under sorcery, and there's a clear distinction made.
...That said, if resisting the RW is the most Kirby can do or he has shown no feats of fully fighting back within a Dream World, he kind of gets nuked non-stop until his dream self gives in via attacks with EE added, Duplication, Danmaku to no end, the whole damn world following her strikes and so on.
Should also note that being able to fight with one's normal self does not translate to Dream Self's capabilities: Serpens straight up mentions how coming from *Dragnar*, she wouldn't be surprised if he could face them "even there". Because normally someone's dream self is helpless. It's also how she planned to kill the whole group after dealing with Miko:
"Here, no matter where you are,"
"Everything is your enemy."
"I just realized... I may as well finish off your every other friend while they sleep, once I'm done with you."
"Besides, this time I am not alone. We are going to the Dream World, and simultaneously attack him from there as the others strike him here."
"Knowing Dragnar, he might be capable of facing us even there, so be prepared!"
Miko for one had resistance and still got nuked pretty handily until she actually figured that as a messenger of the Gods ~ someone with divine connection she could also struggle for control of the Dream World from Serpens.
Serpens herself mentioned in the Dragnar fight that resistances don't stop stuff forever even if they match a power. Because Energeia RE keeps going ~ growing as a fight goes on. It's a question of which side is growing more ~ adapting or enforcing that destruction.
...Long story short, even if it started being matched, RE will keep growing/adapting to nuke it. If there's no RE on the defensive side to keep that resistance updated ~ growing with the user as well, it will just keep making it less and less efficient overtime until it's pretty much the same as it not being there.
