OMG. Your kidding, right?
When you bought the ERA did you think it was a real Cobra then? ERA even refers to the cars as replicas. You didn't understand it was a kit or replica?
Now you are uncomfortable with the idea its a "kit" or "replica"?
You have a replica of a Cobra. Period. Nothing wrong with that. It is what it is.
Whats rude about the person who asked losing interest after learning its a replica? Sounds like you want more attention for your car and become annoyed when inquirers lose interest because when you refer to it as a replica they walk away. Thats their right to walk away or lose interest. You have the right to decide not to answer if you want or tell them whatever you want.
Sounds like you need to care less about what others think about your car and what interest they have in it and be happy with what you have yourself.
ERAs are beautiful replicas. Enjoy the car and stop worrying what others think.
Just my 2 cents.