Sitcoms have fallen into this pattern that's a weird conservative version of liberalism. Like, they show things like homosexuality and nontraditional families as just normal, but apply the 1950s style of family as the ideal family for all those groups. So it's okay to be gay, so long as you don't dare deviate from the traditional family unit model and still conform to all mainstream expectations for how a family behaves. Only difference is now you're allowed to do it with people the same gender as you. Sitcoms build conflict basically by having one character deviate from social expectations, then realize that they should not have deviated from social expectations. And all with a veneer of obnoxious sarcasm.