The issue is not Zoro owning Enma. The issue is that Big Mom had a way worse reaction to Red Roc and Zoro fanboys saying she didn't warn Kaido of it.
She never warns Kaido of people. Only did it with Zoro because of Oden's presence in the sword. Luffy had no weapon to warn off. But clearly RR reaction was worse and it was Zoro's own fault for missing.
She never warns Kaido of people. Only did it with Zoro because of Oden's presence in the sword. Luffy had no weapon to warn off. But clearly RR reaction was worse and it was Zoro's own fault for missing.