The reason almost every kid has the same story is because Brussels sprouts taste quite a bit more bitter than other vegetables, and as bitterness is one of those fundamental tastes that kids don't like, almost everyone's first contact with Brussels sprouts is an unpleasant one. It's not until our taste buds (and souls) die a little bit that they become palatable.
How You Should Eat It:
Because bitterness becomes more palatable with age, try Brussels sprouts out again if it's been a decade or two since you last threw them back in your grandmother's face, because you might find you like them now.
If not, feel free to trot on over to Grandma's grave and spit them out.
If they still taste like hot garbage, you can step things up a bit and roast the bejeezus out of them. By letting the Maillard reaction smooth off the rough edges of their flavor, you can make them way tastier. Throw in some nuts and bacon, cover the whole mess in gravy, and you should be laughing.