it was a playful joke, forget
A "joke", that's all it is.
People always don't understand why I don't like jokes, and it is for this reason. I can't tell if anyone is being serious, I've had way to many experiences in which people were "joking", but they actually meant it. This is why I react to jokes like that. If you haven't understood this yet, then try to get it through your skull before I have to drive a spike through your head.