Undercooked eggplant has a sponge-like texture. I can understand why someone might not like that. Once you cook it long enough/at a high enough temperature it becomes soft/creamy/delicious. I pity you fools who have never had a good eggplant and basil dish from a Thai place, or never bothered with an eggplant parm.
Usually I find the people who hate X vegetable fall into a couple categories either "my mother/father let me eat peanut butter and jam sandwiches/hotdogs for every meal," or "my parent's couldn't cook worth a damn during my formative years, and subsequently I developed a hatred for X vegetable because they couldn't cook for shit.. eg. my mother boiled every vegetable to mush" If you weren't exposed to the food enough at a young age, you're going to carry that with you for the rest of your life. It's like the people who didn't know fish has bones, and you can, in fact, eat a whole fish, and it doesn't have to be a boneless filet ever time.
This fucking thread OP, I swear it just brings out my food autism. Next one you should do "I hate tomatoes" or "I hate onions." REEEEEEEEEEEEEEEEEEEEEEEEE!