Boycotting wife

Question :

As-Salaamu Alaykum wa Rahmatullaah. It’s understood that a Muslim can boycott another Muslim for 3 days. Can a husband boycott his wife for 3 days? If so, how is it done, insha Allah, due to nushuz?

The man is allowed to boycott his wife even if in the bed for disciplinary purpose if sees that she is deserving of it

Allah says

واهجروهن في المضاجع

Surah An-Nisa, Verse 34:
“Men are the maintainers of women because Allah has made some of them to excel others and because they spend out of their property; the good women are therefore obedient, guarding the unseen as Allah has guarded; and (as to) those on whose part you fear desertion, admonish them, and leave them alone in the sleeping-places and beat them; then if they obey you, do not seek a way against them; surely Allah is High, Great.”
Also the Messenger of Allah (May blessings of Allah and peace be upon him) refrained from all his women for a whole month
Note: the beating of the women is without leaving any marks or bruises like the disciplining of a child

Also its not known that the Messenger  (May blessings of Allah and peace be upon him) ever stark any of his wives.
The Messenger (May blessings of Allah and peace be upon him) said, The best of you are the best of you to your families and I am the best of you to my family.