The respondent in the actual post, their assumption is that the metaphor would demonstrate the answer to the proposed question, which for many readers it did. It didn't for thatguy, and this is explained by the following respondents in the meme as being a result of thatguy's existing biases. The reality is that all readers came to whatever conclusion they did based primarily on their existing biases, like for an example a bias toward memes which equally represent big and small boobs. Because there is no complete literal interpretation of the parable as it is written.

If it were a matter of the shared social goal & responsibility of general comprehension between reader & writer (& other readers), there are a few clues which should have suggested to thatguy that both sizes being equal was the intent. There was some missed responsibility on the part of the writer to ensure clarity there too. Of course, no one is perfect and that's why most people just subjectively fill in whatever gaps exist, usually subconsciously. But that's not reading comprehension. The fcat you are albe to raed tihs sntenece and udnrsetnad it is not raednig cmoerpehrnison, any more than when I misspeak to you and you understand what I meant. That's just science. Neurology and free association. A concept fully divorced from reading comprehension. Maybe people want a better term for it now and thought 'reading comprehension' made sense, but it's already taken and means something else.

In reading comprehension, it doesn't matter how confusing or not the parable is, or whether the reader truly understands the writer's perspective once they've finished the text. All that matters is the reality of the text. If it is a text, there is some literary convention in it. Objectively you can understand it or not, and reading comprehension is a way to measure this.