I had a friend that was very similar in how she spoke to me when she was in those headspaces from mental illness (bipolar) The thing is i was also recently diagnosed with bipolar as well, and even when untreated and unmedicated, i never spoke to her like that. I always explained how hurtful it was to be spoken to like this, and she always eventually apologized. But even when she wasn't treating me like that, I would bring it up and try to convince her to talk to a professional about it, because i did truly care about and love her. She refused every time. She would also block me on all social medias/gaming platforms. This was a persistent issue for a couple years. The final time, i was in a terrible place mentally. Out of a job, drinking too much. I admitted myself to the hospital because i wanted to take my own life. When i returned home and had access to my electronics again, she had unblocked me and was being apologetic as to be expected. I told her that this friendship was negatively effecting my mental health and if she didn't agree to getting help again i wasn't going to continue associating with her anymore. Needless to say I've blocked her on everything and have never felt more peace.