Wow! What a douche from hell.

I cannot even imagine being accused of stealing somebody else's idea.

But when you think about it, it's kinda like ideas are all "out there" and there is a lot of overlap in all kinds of art -not just writing. We are all swimming around in the same sea of ideas, so it's not surprising that others' ideas connect with our ideas.

I have no doubt you handled it in a gentlemanly fashion.