Yea I used to be sensitive to people eating in my presence. Not close friends but the coworkers I had way back.

We had this break room where people went to either have coffee/tea or eat their lunchbox. It really felt weird for me that a few were not eating and one was eating his little thing. For me it made me feel vulnerable on his behalf. I felt like he was doing something almost private, in the open, and I felt weird about it.

Now I have never felt the same if everyone eats like the same food at dinner, or going out. I only felt that is one person is the only one eating.

These days I wouldn't even reflect on it. But I was more sensitive then, about A LOT of things I oddly found very embarrassing, often things to do with being HUMAN, like eating, having needs, being sick, having emotions and so on.