context quoted from the source.  
“Rarity arrives inside the pet store outside Bea’s fish tank, both ready for some serious girls-get-together and massive shopping. The goldfish set with her water suit, the two head out across the top shelf where the pet tanks are, intending to leave the pet store.
 
However, Bea notices her principal just strolling by in another fish tank which contains another part of Freshwater and decides to introduce her to Rarity, considering the two had met before through both Twilight Sparkle and Mr. Baldwin a while back.
 
Nurse Fishington carrying him toward the end of the tank, he acts polite as Bea introduces him to Rarity, the proud fashionista from Ponvyille.
 
But, considering his loose tongue and open perspective, he just LETS IT OUT about Rarity being ‘the pony with the fake eyelashes’; because that’s all he remembers about her.  
As if Rarity being humiliated on the train ride during the whole mystery episode wasn’t enough… “