My favourite teacher suddenly hates me or suddenly dislikes me ?

I don’t think he/she/they suddenly hate you. Is it possible they are just trying to be neutral and remain unbiased ? I have a favourite professor in my university. however, when I’m in her class, she treats me just like everyone else and remains neutral to keep it professional. Try not to overthink it; I’m sure it’s nothing you have to worry about ! If I were in your shoes, and it was something that was consistently bothering me, I would make an appointment to talk to the professor about how I’m feeling. How do you feel if you were to express this to your professor? Hang in there!