Would this upset you?

Yesterday during my lunch break at work, my husband wanted to go for a walk with the stroller while SS rides his bike. Mind you SS only plays video games and it takes a whole miracle to get out the house. Anyways, almost mathematically every time the baby is in the seat, she poops. So he put her in the seat. I then went to kiss her and realized she was poopy, so I changed her obviously. My husband complained and Said "if we don't hurry up, SS will go right back in the house, it's taking too long" basically insinuating that I shouldn't have cleaned the baby's diaper. This really upset as SS is 10 years old and it literally takes 2 mins to change the diaper. Am I right to be upset? My baby also always falls asleep in the stroller so I didn't want her to sleep in poop obvisouly.