Bro, you can't talk; you look like the dwarf from Snow White and the Seven Dwarfs.
Snow White Insult
Explanation
Explain Bear
Okay, listen up, buttercup. The joke is that someone is calling someone else short by comparing them to a dwarf from Snow White. I bet you didn't even know that Snow White has a LOT of dwarves: Doc, Grumpy, Happy, Sleepy, Bashful, Sneezy, and Dopey. All pretty short dudes. You probably thought they were cool dude's though