So I am 22F and the class president of my third year medical school class. Last year the president of the students association for the medical school brought up a mentorship policy. It's an opt-out programme where my class is supposed to tutor the second years in a 1:1 ratio. For about a week I told my class (70 people) before and after lectures as well as in the evening in our WhatsApp group. I was very badly ignored (I live in an African country but have an American accent because I grew up there) and even confided in the president because I had never been so disregarded in the 3 years I was class president and it really disturbed me. He told me not to worry, and just submit the full class list at the deadline if no one comes to opt out of the programme. I did that and kinda forgot about it.

This year they brought the mentorship list and this one girl (who always sits in the front of the class) started texting in the WhatsApp group. Let's call her A and I'll be me. 

A: I think some of us are still finding our feet in 3rd year and we all need help. There are some students in their class that are more qualified to mentor their own people. Honestly, you should have asked us all individually first before anything else. I understand very much how they need help but what is the use if they won't benefit much from some of us?

Me: Lol for real? Last sem I said several times that this was an opt out programme and if you did not want to be part of it let me know, and I will take you off the list. Literally no one came.

A: Well I'm sorry but if I didn't hear about it then the purpose of the announcement wasn't achieved. Besides I'm just sharing my view.

Me: Noted. Maybe next time I'll bring a loudspeaker. 

What followed in the WhatsApp group was a bunch of memes about what I said, but in class the next day people were saying I was too rude to her, that I really hurt her feelings. A few people called me a bitch to my face for it. And my friend that I study with said she won't study with me til I apologize. I see nothing wrong with what I did, but if anything she owes me an apology as well. She ignored me, was acting super entitled (how am I supposed to take time out of the day and ask the whole class individually???), and basically said I had failed in my duties because she wasn't paying attention. 

I'm getting a lot of flack for it and am seriously considering resigning.  AITA?