if my disability is inconvenient for you, imagine how inconvenient it is for me

I am a disabled student with academic accommodations, one of which is that I have flexible deadlines for my academic assignments. A few semesters ago, I tried to turn in a late essay, but my professor refused to accept it because it was "too late," even though the semester wasn't even close to ending yet, and that she didn't have time to grade it anymore. It's a professor's job to help me learn, whether accommodating my disability is convenient for them or not.