You shouldn't criticize your partner's home.
Joel is visiting his boyfriend's small apartment for the first time even though they have been serious for a while.
Joel wants to assess what living together would be like based on the state of his boyfriend's apartment.
Joel comments on the fresh flowers and lived-in feel of the place.
Joel casually questions why his boyfriend didn't clean up before he came over.
Joel's boyfriend appreciates that Joel noticed the effort he put in.
Joel's boyfriend is hurt and asks him to leave.