How to get out of an uncomfortable egg culture situation with this one simple trick.
Real talk: Calling people eggs is a violation of the egg prime directive, and is considered invalidating as you are trying to say that a person is not the gender they identify as, that their identity is invalid. Don't call people eggs, like ever, it's extremely uncool.
Fem boys aren't an example of an egg anyways. If a person is calling a femboy an egg they are completely misunderstanding what an egg is.
Eggs are funny and sometimes adorable because they don't quite know who they are and they give hints at who they want to be. A femboy is someone who knows who they are.