The correct idiom is a bee in your bonnet. The image is of a bee flying around inside your hat, worrying you.
Someone who is very worried would be "on pins and needles."
It's not an idiom - it means a cup with some tea in it. NOT your cup of tea, however, is an idiom - it means that something is not to your liking or preference.
Comparing is not an idiom, it is an action. When you compare things, you are noting how they are alike and different.
It means that you will like it. Something you are interested in.
It's not an idiom because it means exactly what it seems to mean. To take offence at something means to be offended or insulted by the something, so "did not take offence" means the opposite.
This is not an idiom. It means exactly what it says in grammatically-correct fashion.
This is not an idiom. It means just what it says. Someone does have a choice and the choice is something that will bring trouble.
That's not an idiom. It means just what it looks like -- something is fit for you to eat.
An example of an idiom in "The Bean Trees" is "out of the blue," which means something unexpected or sudden.
The idiom "beside themselves with worry" means being extremely anxious or upset about a situation. It implies feeling overwhelmed by worry or concern to the point of being unable to think or act rationally.
To get behind something means to support it.
It's not an idiom. It means you pick and choose what you want -- pick something out and choose it from a selection.