They're annoyed at your "Have you considered that there's a reason?" for strongly implying there's an explanation for the incorrect fact. They dislike that whole type of statement. Their reading comprehension is fine and you're just nitpicking their wording.
Also, saying "Have you considered that there's a reason?" is not at all the same as "asking why it does a thing". It's a strong statement on its own. If your original comment had stopped after the first sentence then you would have gotten a very different response.
Also, saying "Have you considered that there's a reason?" is not at all the same as "asking why it does a thing". It's a strong statement on its own. If your original comment had stopped after the first sentence then you would have gotten a very different response.