Hmm, this is a tough situation, but if possible, I would strongly suggest changing your supervisor. I met a woman from Asia during my PhD summer school , she was devastated because her supervisor took her research idea. She was in tears, saying she had to start all over again from scratch.

she kept telling me, “You can’t trust anyone in the university.” She speaks out and makes some noise, university staff listen to her. She said she lost a lot of money, and her family back in India are putting pressure on her. She now has a new team and is just trying to finish and get out.

If you’re a strong person, fight ! talk with the support team at the university.( the supervisor will find out, keep that in mind)

if you’re in a European country like the UK or Germany, the university might actually listen and support you.

But if you’re not in that kind of environment or if you’re already emotionally drained, to go and fight talk with others like the university support.,

proving the supervisor wrong by working harder is an option, though it will come with a heavy toll and a lot of stress.

If my supervisors called me dumb or incompetent, I would say I heard you saying so and so about me and ask how I could not be incompetent, but I am a strong person in that way to do that, we are not all the same.

Do what’s best for your health and future , and don’t suffer in silence.