rusticated = suspended, but this is not a common expression. I believe it is only used in a small number of elite universities. Most people wouldn’t use it. Many people would not, I suspect, understand it.
‘echo’ here = agree with. Just as an echo copies the original sound, the person doing the echoing has the same feelings as the original speaker.
sounds a little off, but if you were to use it , it would be, “I don’t echo what you said”.
re-echo simply means repeat the echo. It would be a redundancy in most contexts, as an echo is a repeat.
He was rusticated is DEFINITELY wrong in this context. When a person is suspended, he is banned from attending school/classes for a length of time. It has nothing to do with being hung.
‘Suspended’ is the wrong term for describing someone who hangs himself and ‘with a rope’ is a redundancy. People would say,
He hanged himself and died.
There is a difference between the two past participles /past tenses ‘hung’ and ‘hanged’. A picture is hung on the wall. A person condemned to death is hanged by the neck.