Hot Tub Time Machine will follow the "Black guy in a movie" rule. In the movie a group of four guys, they have one black friend. Even though there's only one black guy, they have to make sure they are not a threat to the white man's masculinity - like crazy hair or Martin Lawrence or gay. In this case he's overweight.
Then if they are straight, they are henpecked and have an overbearing wife they are afraid of. Check. We have that too.