Is it considered fat shaming when you ask an overweight person if they have eaten or what they have eaten, while not asking skinny or average people?

People in my group, always seemed concerned and preoccupied if a particularly heavy person is eating or what.

This one guy was asking this man who weighs about 400 pounds, what his absolute top 5 favorite foods were. In my opinion, it sounded kind of rude. The guy seemed like he didn't really want to answer him. He seemed uncomfortable by his question.

I know and like the guy who asked him, and I know that it was not his intention to be rude.

Then, someone asked a very heavy women what she had eaten for lunch.

Other people, who are average, they could care less what they eat or if they eat.

I had eaten lunch before I came into group, and I just brought a diet soda with me. No one paid any attention or cared that I did not have any food.

I'm just curious, is this considered fat shaming or even just considered rude to comment on overweight people's lunches and food likes, when average or skinny people are not being asked?

I'm not trying to start anything on PF, I'm just wondering.