AITA for telling my husband if he forces his daughter to go to school with poor hygiene as punishment, I will divorce him ?

(41f) have a daughter (10f) from a previous relationship and my husband (35m) has a daughter (13f) from a previous relationship. My stepdaughter has been the near-perfect child for a long time. She hasn’t ever needed to be punished since I’ve with her father, until recently. She had a problem with another girl (13f) at school. The other girl made fun of my stepdaughter’s “lesbian” mom and my stepdaughter made fun of the other girl’s “poor” mom. The parents of the other girl grounded her for 3 weeks. My husband wanted his daughter’s punishment to match the crime. Since his daughter make fun of the other girl’s financial situation, my husband wants his daughter feel like how it is to be extremely poor. The other family isn’t extremely poor, by the way. His plan for his daughter is to go to school with poor hygiene, for 3 days. No shower, no deodorant, no brushing of teeth, and reused clothes. I told him if he goes through with this plan, I will divorce him. Am I the asshole ?