I'm guessing you just peaked at the boss design on youtube and considered the whole thing a joke eh?
because the game doesn't treat it as a joke.
I mean, let's not get crazy here.
The game spends about 5 hours going on about how sexual deviancy and forcing yourself on others is really bad and a shitty thing to do, using some really heart wrenching imagery and themes to really express how much it can mentally ruin someone.
And then 10 minutes later, they abandon that entire theme to have so mad capped antics about teenage boys throwing their teenage girl friend under the bus by letting some creepy art kid paint her nude even though she's not about it. ITS A JOOOOOKE!
That game treats it's themes seriously until it doesn't, just like every other persona game. It's why persona games have nothing to say. I like Persona 3, 4 and 5 a lot, but those games approach the themes they want to talk about and run from them like cowards, every, single, time.