What is the ruling on parents humiliating their son who lives with them out of malice, and what should he do while he is still in university?

The situation described, where parents harbor resentment towards their son, is unusual. Patience with them is necessary because it is a form of trial. One should pray for God to rectify the situation, respond to ill-treatment with kindness, and avoid displaying anything that might provoke their resentment or envy. If necessary, involve wise people of good standing as mediators.