So you would be totally alright if you had a teacher that treats the whole class like shit and is extremely unfair in grading?

I don't care if he is a researcher or knows everything about what he teaches. If he doesn't do the teaching well, he shouldn't teach in the first place.
I think we've all been in a similar-ish situation, katsuki, which is why people asked for more details, because it really depends on the details here.
If you want some helpful advice, go open your free agenda or go to your student association website, and look up your student representative. At my university, this person's title is the Student Association's Vice President Advocate. This person is an elected official who is paid to know the rights of students and to advocate on your behalf. They would guide you regarding how to appeal, how to go to senate, and how to take action in respectful ways (not to mention tell you exactly how your problem is or isn't a problem, for example, they would tell you you need to ask if you're graded on a curve, if you haven't done so yet).
People were repeatedly asking reasonable questions in an attempt to help, and you (originally) didn't answer them, or you took jibes and rolled your eyes at the people with more knowledge who were trying to help you. This was my issue with you. Do you not have any problem with this?
If you look what I quoted above, every time someone asked for more details, you might want to go over how you responded to that question.
What about being graded on a curve? Did you even answer that question? Have you asked him yet? Furthermore, once he submits his marks, senate will override his grades and curve them for you if they deem them too low. Your professor is not all powerful, senate is.
Your professor very well could be a terrible human who is doing more harm than good. But the issue is not so black and white; the issue takes place in an established institution with protocol and elected officials whose role is solely to help guide you through the process of standing up for your rights and also not causing a big problem when perhaps some of the problem has to do with how you're attempting to solve it (aka trying to get him fired).
This goes back to what I said about developing your ethos earlier, which you rolled your eyes to. There was a reason I said all of this earlier, just like there was a reason a lot of people asked questions earlier. Your responses to the individuals who were trying to help you were immature and self-centred. I have a problem with that.