DM: Cozy Glow approaches the Headmare's desk.
Gallus (RD): And then the real mastermind turns the chair around dramatically?
DM: Well… Sure. If that's what you want to think. The chair turns and seated there is a pale unicorn with a slick black mane and a goatee. Known to some as Chancellor Neighsay of the Equestria Education Association, or the EEA.
Smolder (RT): I see that the pony puns continue…
Sandbar (AJ): You make it sound like we should know him.
Silverstream (PP): Can someone else say "Snape" so I don't have to?
Gallus (RD): Snape didn't have a goatee.
DM: <ahem> You all recognize him from your first week at the School of Friendship. He's been a vocal detractor of the School of Friendship since day 1. He's tried to have the entire school shut down, and on one occasion nearly succeeded.
Ocellus (TS): Why?
DM: Long story short: Because a certain five of you were attending.
Yona (FS): Yaks may be proud, but yaks are at least not bigots.
Silverstream (PP): Wow. Snape would've just tried to expel us, not shut down the school!
Gallus (RD): It's the goatee, I'm tellin' ya…
"Um, actually, in the original Scholastic / American distribution of the Harry Potter books with illustrations by Mary GrandPre–" Get outta here, I looked that up already.
Spock sported a goatee in the original Star Trek pilot episode. Paramount asked him to shave it off because too many people in the initial screening felt he looked like the devil. XD
Movies have a way of establishing canon in the minds of many even where they disagree with the books, let alone on matters the books did not clearly address.
Book illustrations are saddly not always representative of the book. The first covers for the Discworld books had characters who didn't look like how they were described in the book at all, not to mention of dubious quality.
Beside, I'm quite certain if Snape had a goatee, it would have been mentioned. His facial features are described more than once.
When you can turn friendship into a rainbow canon that can turn gods to stone maybe you should be more careful who you teach it to, both Dragons and Yaks have shown violent tendencies and changelings only recently turned good. Hippogriffs are fine tho.