Example 1:

Debbie has been really unhappy recently. I thought she was
just busy and maybe a little stressed out. It turns out she’s had a bee in her bonnet about something
I said to her last week. She was complaining that she never has money. She goes
to school full time, but she still has a lot of free time, so I suggested she
get a part-time job instead of going to so many parties. Apparently, she didn’t
like that and has been mad at me since then. I was just trying to help!


Example 2:

I really don’t like when people borrow something and “forget” to return it. That has always been a bee in my bonnet.

Explanation:

Imagine wearing a hat (a bonnet) and then imagine a bee
inside your bonnet! You would certainly not be comfortable or calm. This
expression is generally used to talk about negative feelings. There are a few
ways to use a bee in my/his/her bonnet.

In example 1, Debbie has a bee in her
bonnet about something the speaker said. In other words, Debbie is
upset/angry about what the speaker said.

In example 2, the speaker explains that it bothers them when borrowed items are not returned; this is a bee in their bonnet.
Use the verb have to show angry.
Debbie HAS a bee in her bonnet. Debbie is angry.
Use the verb be when talking about something that bothers you.

Littering on the street IS a bee in my bonnet.I don’t like littering.
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