I don't think it's a bad thing if you really do just want to play around with a show's canon. I would never rag on someone for simply making a fan creation I didn't like. And I don't think it's a crime either to have written a meta that features interpretations of character's actions and lore that is not explicitly canon.
It only becomes something distasteful if you use your specific headcanons and biases to say and imply horrible things about other fans, you know, real world people, especially if you're using real world societal problems to do so.
(And all that said, nobody deserves harassment or to be bothered on their main blog regardless. It's one thing to talk about takes you see in public, it's another to go to a person directly and start badgering them against their will.)
