I’m far less upset about being called ‘mentally ill’ than by the presumptuousness of people like this. The type that has to emphasise he/she is a ‘survivor’ and has 'lived experience in a way that excludes those who don’t adhere to his/her POV re mental illness.
Another term used is ‘expert by experience’. Another term hijacked by the type of person who’d be totally against a forum such as this.