Let's say, for example, that instead of diapers you wanted to stop liking... hamburgers (random thing).
There are several methods you can use:
1) overdose: eat too many of them you swear you don't want to see an hamburger anymore
2) brainwashing: have an hypnotizer convince you that you hate them to death etc.. etc..
3) mind association: associate hamburgers with something unpleasant (i.e. rotting corpses - random thing) so that when you think of hamburgers you think of rotting corpses and you can't eat hamburgers anymore.
4).....
5).....
etc......
In the end, will you have stopped
liking hamburgers? Well, IMHO, you'll only have found a coping method to avoid eating them, but deep in your soul you'll still like them.
And back to your original question, I bet you're gonna get mostly negative answers from people's direct experiences. I myself tried to stop about ten years ago... it lasted less than 6 months. You may say my will wasn't strong enough, but since diapers are not harmful to yourself nor to other people (unless you keep being around in stinky diapers...), which is the reason to damn yourself for a thing you like?
Life is hard enough because of all the things we
don't like but we nonetheless have to bear... why not using the ones we
do like to make it a bit more pleasant, instead of getting mad at ourselves for them?