Wanted: Your Opinion On A Hypothetical Situation

Here’s a question for the internet… What is your opinion of this purely hypothetical situation? Because I don’t actually know any couples who would ever experience this. So let's just pretend I might possibly know people who just may behave like this. You know, on a really bad day. Just maybe.

The night before:
Spouse A puts some chicken in the fridge to defrost and makes a marinade for the chicken for dinner the next day.

The next morning:
Spouse B makes breakfast for the kids while Spouse A cuts the somewhat defrosted chicken and puts it into the marinade for dinner. Spouse A then does the dishes because otherwise Spouse B will complain after dinner that there is not enough room in the dish rack because Spouse B is physically unable to put the dry dishes in the cupboards and doesn't know how to load the dish rack properly thereby adding to the lack of space for the wet dishes.

As they are leaving the house, Spouse B says to Spouse A, "Have a great chiropractor appointment this afternoon!"

The afternoon:
Spouse A arrives home 20 minutes later than usual (but as planned due to the doctor appointment). From outside the house, Spouse A hears Baby tantruming and Child whining. Spouse A takes a deep breath and walks in the house: prepared to help with cranky kids. Child and Baby run to Spouse A; the tantruming and whining continue. Spouse A hugs the children and says to Spouse B, "Wow. I hope this hasn't been going on for too long." Spouse B glares at Spouse A and says, "You're late. Where were you?" Spouse A says, "At the chiropractor. Don't tell me you forgot because you mentioned it this morning. And holy shit, it's only 20 minutes later than I usually come home. You leave me alone with the kids all day on Saturdays. Every. Week." Spouse B grunts. (edited to clarify that Spouse B enjoys teaching piano lessons on Saturdays thereby leaving Spouse A to care for Child and Baby. Spouse A usually doesn't mind caring for Child and Baby on Saturdays. Except when Spouse B complains about being left alone with Child and Baby for 20 minutes.)

Spouse A takes the children far far away from Spouse B who obviously needs time alone. Spouse A plays with the children and tries to keep the peace between them (but fails due to Baby and Child being cranky on a Monday) while Spouse B cooks the already-prepared-and-just-needs-to-be-cooked dinner. Spouse B tells the family that dinner is ready but does not sit with the family and instead sulks in front of the tv.

Spouse A feeds the kids, washes the dishes and cleans the kitchen. Spouse B sulks in front of the tv. Spouse A bathes Baby and puts Baby to sleep while Child stands outside the bathtub whining about having to play independently. Spouse B sulks in front of the tv. Spouse A bathes Child, reads books to Child and puts Child to sleep. Spouse B walks into Child's room, kisses Child good night, walks back to the tv and sulks.

Now you tell me, hypothetically speaking: does Spouse A or Spouse B have more of a right to be upset and sulk in front of the tv?

And you tell me, hypothetically speaking, of course, which spouse was extremely pissy and moody for the rest of the night and never apologized to Spouse A the other for being a selfish ass?