This is about hair, I like this fem-Justin design, I wanted light teasing, and this height difference is easier to work with, so yes. Yes to Justin the barber.
In the context Justin was teasing at, a "beard" would be a man pretending to be Susan's boyfriend to give the entirely false impression that Susan is heterosexual.
Which Justin jokes about here as a play on words and messing with Susan, but it does come from the very unfortunate reality of people wanting, or having, to hide their non-heterosexuality. Which I would love to say was all in the past, but humanity's got a long way to go to reach an enlightened version of itself that several contemporary moms would still write angry letters to editors about.