Nope i would definatly not be offended if someone told me they didnt like the gift i gave them.
I like people to be straightforward and honest with me.
If they had to tell me they don't like it, i would offer to take them to the store where i bought the gift and help them exchange it for something they like, even if it means i have to pay extra towards it, at least then i know it won't be left in some closed and never be looked at.
We all have different taste
If someone gave me something that i don't like, i would thank them and keep it, because i know it's given with a good heart, and i will give it a special place. I have yet to get something from someone that i dislike, because i know they gave me a piece of themselves, and i cherish that.