The Little Guy is tiny. Some might even say smol. So tiny that he could easily pass for a pre-schooler. Which is why it speaks volumes of the character of the Bro leveling a kick at his diminutive frame. Only a base villain would attempt such a thing.

He's adorable.
He's barely knee high.
He's...got a mouth full of razor sharp teeth that are going to latch on to whatever comes close to causing him harm.

Okay, so maybe it along with character, trying to kick The Little Guy also speaks volumes about one's lack of preservation instinct.