Many students interpret bad grades in writing assignments as bias on the teachers’ part. That can happen, but more often the position or argument expressed isn’t necessarily derived from knowledge.
Aping the teacher/professor is the fast path, not only for the purposes of being agreeable, but because the argument is well thought out at some level. Part of the educational processes is being able to make an argument that you don’t agree with.
Humans are able to fill in the blanks on arguments that they already understand and do so implicitly without even noticing. So, if you make an argument the professor agrees with and is familiar with, you can skip steps, and the professor will still grok it. If your argument is novel or unfamiliar, missing steps appear as logical leaps, even though those same missing steps appear as extraneous detail to somebody already familiar with the argument.
Students usually talk about things they don't know, understand or can relate to (yet).
Or, as Alan Kay put it
> Socrates didn't charge for "education" because when you are in business, the "customer starts to become right". Whereas in education, the customer is generally "not right"
It, honestly, doesn't sound true.
Teachers have ego, yes, but they also can recognise value in student's work, even if it doesn't please them.
Of course the wrong answer is wrong, even if the student put a lot of effort in it.