My professor says I'm slow.

He mocks my natural pace of doing tasks. I am naturally slightly slower than the average person. I struggled with sports too for the same reason. My fastest is your somewhat slow. It's just how it is.... I have to work extra hard just to do an average person's tasks.
And so he called me slow.... A robot.... And expressed his frustration over it. He repeated it around 4 times in the same minute. It felt extremely hurtful. And yet today I was eating chips extremely fast. And I know next time he's gonna point that out when I'm doing a task slowly. He doesn't understand that picking chips and putting them in my mouth is not an advanced task... But holding the laryngoscope the right way, and making it sure it doesn't hurt the throat and cause trauma, and then visualize the voice cords.....it really is overwhelming for me.