not able to stomach (something)

1. Lacking the courage, determination, or resolve to do, face, or experience something unpleasant. The military always sounded interesting as a means of traveling the world, but I wasn't be able to stomach the thought of having to kill. I'm not able to stomach scary movies at all, but my girlfriend loves them.

2. Physically unable to digest or tolerate a certain food without discomfort. I love living in India, but not being able to stomach spicy food makes mealtimes here rather difficult. I'm just not able to stomach rich, fatty foods like I did when I was younger.

not able to stomach someone or something

and cannot stomach someone or something

Fig. not to be able to put up with someone or something; not to be able to tolerate or endure someone or something. Jane cannot stomach violent movies. The sensitive student could not stomach a lot of ridicule.