Broke down at my last day at work today and I feel awful

Today is my last day and I was planning to just keep everything in and leave on a good note. But the way my manager was talking to me and undermining my work really upset and made me broke down because of how cruel she is being.

We are tasked to do the impossible job of packing hundreds of boxes in less than 3 days while I also still need to do admin tasks and her last minute request. Experienced some delays and lack of materials which I already voiced out weeks ago. The way she talked to me was so disrespectful and rude it had me broke down in front of everyone and I felt so shameful and overwhelmed. How is it my fault that we are on a time crunch and experiencing delays? WHICH I VOICED MY CONCERN ABOUT WEEKS AGO…

Never done this in my entire career and I feel awful making it all about myself. Gosh my poor coworkers dealing with this. Before anyone said anything, yes I tried talking to management about what’s happening and I got no help, stating it’s my manager’s first time having a direct report. Respectfully not my fault but I really just need to get this out.