Perhaps people get angry when you don’t agree with them because they take it like a criticism. An opinion is part of you and unless you work or developed on it, it may feel like rejection of part of yourself from the other person. Most people don’t like to be criticised, perhaps because we like to think of ourselves as perfect people, at least to the outside world?!
Just a thought..
Your thoughts on self esteem etc sounds true enough too… talk of if they’re happy… ;-/
Hope you’re feeling better after ranting here. It is frustrating not to be heard out.