It's possible that the writer saw your post and was inspired to make his own. It could just be a coincidence.

Either way, I think the content between your article and his is different enough that it makes no difference. It's a similar topic, sure, but there don't appear to be any signs of plagiarism. There's nothing wrong with being inspired by someone else's post to write on a certain topic. If that were wrong, we would only ever have one point of view on a news event. It's only a problem when your specific phrasing is claimed by someone else as their own.