I don't like onions. I won't eat anything with onions in it.
I don't make a big deal if I'm served something with onions. I might move it around and make it appear that I've eaten some. Or I might lie and say I'm not very hungry or not feeling great but.... I won't eat it. I don't really care if that makes someone not invite me over for dinner.
What don't you like about onions? Does it matter if they are raw or cooked?
It's a combo of the texture, taste and smell. I can eat raw onions. I can eat food with chopped onions in it (i.e. lasagna, tacos, etc), as long as the onion isn't overpowering. But I can not eat, or even stand the smell of, sauteed or fried onions. Onion rings might be the worst thing ever invented.