I'm thinking of purposefully buying sweets my wife doesn't like so I don't have to share.
Why don't you want to share your sweets with your wife?
Because she eats too many of them.
That is rude.  You should not be deceptive but you should buy something for each of you so both of you are happy.
You are just a hater, wife, kids and snacks should be mine and mine only. I am allowed to pick and choose.
How would it feel if others didn't share their belongings with you? They are your family and if you love them, then you should feel the obligation to share with them your food.