They're not just calling it big, they're calling an elephant big in comparison to a crude 8 year old's drawing of said elephant (and of course the colouring is not inside the lines because it doesn't have to conform to the consistent rules of an elephant). What purpose does that serve unless you're the 8 year old trying to make your drawing sound impressive? See how small and unique my elephant is?

Meanwhile the whale sitting right next to the elephant is like wow that was a very specific callout on their size when I'm sitting right here. That kid must really hate that elephant.

It's quite ridiculous. Wrong or right don't factor into it.