/feh/, your problem is not Edelgard.

The reason you so profoundly seethe at the mere sight of her has nothing to with her actions, or her character in the game.
The reality is your inner self-pity. You refuse to stand up for yourself. You refuse to believe in yourself and strive for something greater. That is what Edelgard embodies and you subconsciously object improving upon yourself. This is why your hatred for her is so great compared to anybody else, despite her being a completely fictional character with having practically no real impact on your life.

You just hate yourself.
So think before you get worked up over an innocent discussion about Edelgard and look in the mirror at your own self and perhaps you might find what's really holding you back.