I have had farmers who were born with a little bit of ability to farm hating berries and green.They were my first little people.Trying to teach a farmer to forage with a hate of berries,or a farmer who hates swimming to fish or a doctor who hates bushes or the color green.
But when you have a village with alot of sick people and even the doctors sick and the only well one you have is a builder who hates the color green is a pain.Especially when you need to become a doctor pretty quick or you'll lose your little people.That was too hard to play.I kept putting him up to the cactus and the other herbs to get points enough to become a skilled doctor and he kept shaking his head NO.I was lucky after numerous times he finally gave in.But he didn't cure all of them,he just did the one who was a doctor and then he took over.And the builder went back to building.