I lived with someone who refused to eat anything that she knew had onion in (if she didn't know, she was fine, like burger patties), it was very difficult to cook in that household
I was like that until pretty late in my teens. I found cooked onions kinda gross and off-putting. When I think about it now I feel bad for my mom who used to cook for me.
onion is an extremly strong contenter .. like all the forms , its cool with everybody .. you cry when you cut it , its smells proclaims a good meal coming...
I went to Ethiopia and found they eat onions a lot. You grind them to a pulp (e.g. In a good processor, so no crying) and fry the pull with seasonings and tomato paste. Best sauce ever.
score the onion horizontally and vertically like a grid without hitting the root, then slice the face to create a good dice and then quickly discard the root without getting the juice on your hand, then quickly clean your knife. that's the solution.
Very unconvential, but what I do... I have diving goggles that cover the nose and I just put them on when I cut onions. No more tears, but you look ridiculous for a while :D