Sure. It's not so much "Look at this rotten meat. You should find this foul!" kind of teaching, but more kids-watching-adults-react, and deciding that they will react that way too. My daughter was born a picky eater. My son was not. But he watched her decide that things were yucky enough to become picky over time. Now she's grown into an adventuresome eater (she'll at least try "weird" things - this she learned from me - I'll eat anything once. If it's good I'll eat it again!) while he still only likes to eat his "favourite" things. That's learned behavior.
(Of course, this also shows how much folly parenting can actually be - I have actively taught them to be experimental eaters. So far that only worked on one of them.)