This is kind of what its like for me. White onions, same as you, they need to be basically liquid/mush before i can eat them.

Red onions however are the devil. I can’t stand them in any form.

For me its an issue of texture, i hate how it feels to eat onions and peppers. I have been physically sick (vomited) because i bit into a bit of onion/pepper i didnt know was in my food. My body just rejects them.

White onion= flavour good, texture bad (unless mush) Red onion= flavour bad, texture bad Pepper=flavour overpowering and i am never sure if i like it or not, texture bad.