This colleague disagreed with me saying that people with mental illness have no insight and need support.
Maybe there's a truth to that, but that's a wide and undefined target. People believe what they believe. I wouldn't look for validation from such.
A few years ago, I talked at length on the phone with my mom's former neighbor who I deemed my mom's Frienemy. She actually cried in frustration both from how my mom treated her and frustrated by my mom being nice but still acting like the person with BPD, Depression, Anxiety, PTSD and Hoarding that my mom was. Then she laid into me, swearing at me because she couldn't

believe what I was saying, "but she's your mother!" And for a while I thought I was comforting her!
Be careful with whom you share, and don't expect others to see the same as you do. They didn't go through it as you did after all.