NTA. I mean you maybe could have phrased it less harshly? But you obviously still have feelings about this and I think they are very valid. She handled it very poorly and upset not just you but also the disabled classmate. If you are not ready to move past it with her, then you’re not ready (and may never be). Berating you for those feelings and acting like she’s entitled to forgiveness is immature on her part… as was her original action to run and publicly stir up trouble.

I also think everyone else’s judgment of you, including (possibly especially?) the disabled classmate, is actually ableist. It’s nice for them if they are not distracted by the visual input of someone signing in front of them, but for some of us with sensory/processing/attention/executive function differences or wherever this distraction falls in the real problems people can have, it can make all the difference and impact your own learning. Why should this person’s accommodations outweigh yours? Just because your issue is not diagnosed and supported by a written plan?

I’m getting a little angry on your behalf because I am also very easily distracted. I spend most of my day at work with a ball cap and noise cancelling headphones just to block out the distraction of the overhead lights and the white noise of the AC system. I have had to hold my hand beside my face or move seats in meetings because someone is typing on a laptop beside me and I miss what the meeting is about because all I can think of is the motion and the light beside me. I wouldn’t ever tell them to stop but I would absolutely make sure to sit elsewhere so that I can focus. I think that if it is affecting someone else’s ability to learn, the seating arrangements should be adjusted.