One of the commenters on fandom fail-anon says it best, that there is a certain level of entitlement, but it's that while the recipient isn't entitled to getting a story they like, they *are* entitled to having their request filled. The writer isn't entitled to writing a story that they love about their own head canon, but to writing a story that fulfills the letter and spirit of Yuletide's rules.

And honestly, the grossest thing about this is the fact that they wrote about subject matter seemingly tailored to upsetting their recipient.