The topic of graduation thesis is a category, and it is also the general outline of your thesis content. Of course, you can ask the teacher or discuss with your classmates. Of course, the final topic of the paper should be based on your own ideas.
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In China's traditional concept, teachers should take care of students and students should help teachers. Your request for a new teacher shows that the teacher is either academically incompetent or morally incompetent, and the teacher has no face. Other tutors accept you, which means that he thinks his academic level and personality are higher than the other's, and he is likely to be considered as hitting a person when he is down. Besides, he set a bad example to the students. It may be more acceptable for others to propose major changes. Think of Cao Yunjin just asking himself to go it alone.
From the moment you openly asked for a new tutor, you broke with your former tutor, "be tough or leave." In fact, master's degree requirements are not high, and you will have a good chance by your own efforts. When I was a freshman, my tutor found that cancer had been being treated and left us behind, but we still thanked the teacher.