It is not allowed for one to completely cut ties with those who it is wajib to keep ties with. Yes, one may not have a good relationship with a certain family member and may not want to see them face to face, however there are a number of actions to still keep minimum contact which would not be considered cutting them off entirely. This could be through the phone, email or messaging apps which society would consider still keeping a relationship.
With parents one should try as much as possible to keep a good relationship and the son ignoring his mother would be doing qat al rahm.
May Allah swt grant you success