I grew up in a family in which you didn't leave the table unless you ate everything on your plate, and if there was something new made, you had better believe some of it was put on there for you. After you've sat at the table for several hours while everyone else is allowed to watch tv or play games or go outside but you have to sit and stare at a plate of food that's slowly getting colder all because you don't want to eat it, you learn really fast to put your big kid panties on and not be picky. And if you didn't eat it by the time everyone else went to bed, your plate was covered and put in the fridge. Guess what you were having for lunch the next day!

The only "get out of jail free" card IMO is a medical issue/disorder. Saying you never tried it but know you don't like it, that you tried it once years ago and thus it's gross, or that "it makes me gag" is just an excuse.