Exactly. And you're not even pointing out that the human frame of reference starts at -18 Celsius! So a significant portion of the time, you're going to have to use negative numbers to describe the temperature.
Edit
To clarify, I am not arguing that Fahrenheit is a better scale in general. I'm simply saying that it's human-centric. Celsius is perfectly usable for human purposes, and also much more useful than Fahrenheit for scientific purposes. I'm just explaining how the meme makes sense to me