Of course you can't change your own personal likes and dislikes. This has nothing to do with the power of free will.
You are consciously aware of your likes and dislikes, and they can influence your conscious choices, but they do not dictate your conscious choices. You still have the power to choose.
You're waffling, and indulging in equivocation, but you still have the problem that I can't use this 'power.' to override my revulsion. I may be aware of my revulsion but what produces that response clearly isn't under my conscious control, so that even if I can choose to avoid mayonnaise I don't have the 'power' to choose not to react to that noxious substance as I do and decide that I like mayonnaise.
In other words, my food choices are dictated by a personal trait that is outwith my conscious control (or awareness, or whatever your term
du jour is) so that the food choices I am free to make are determined/constrained/dictated by a prior condition involving a personal trait that I can't consciously overcome.
As such, my food choices aren't quite as free as you contend, and I'd say this routine example kicks your pet theory into touch.