How would you handle this?

Hello everyone. This time I want to tell you a little bit about a recent incident that is still on my mind and I struggle with understanding how I should have reacted.
I've been in contact with the job center in my area, because I couldn't attend any job or apprenticeship after school due to my ibs (which was a whole other ordeal). Now that I feel a bit better and I really wanna start to be independent etc. but was still a bit scared that i wouldn't be able to work full shifts I thought to get help from the job center.
The woman there suggested a program where they could evaluate where I'm at work-wise.
I thought that would be quite reasonable so I called the number and they gave me an appointment where they would give me a tour and showed me everything and explained how everything worked. I did that, answered certain important questions that were asked by the woman that showed us around and then eventually she told me about the canteen there and that we would get some money each day, to be able to eat there. I told her that this would be a problem to me because I can not eat everything. She asked me why and I told her about my ibs. She knew what that is and made a weird comment, that I had this probably because of my mental problems that were very prominent in the last years where I couldn't work (I had told her about these issues earlier). I was a little confused because I had ibs since I can remember and not just for the last couple of years, so why would she say something like that? Well, I brushed it off, but she also asked what I could eat. I told her of the various foods I had to avoid and she kind of didn't belief me and tried to make sense of what I said, instead of just believing what said, because I think I know myself better then she does. When I mentioned garlic, she said yeah she could understand that she has also issues with it but she still eats it because it's just to delicious. I awkwardly knodded and then had her tell that that's an issue because if I am not eating in the canteen then what shoul I do with the 3,80 euros I would get everyday... I told her that I don't need it and that they can keep it, but that wasn't possible and she didn't had a solution yet but she would think about it. (I mean 3,80 euros? Why being so complivated about it) Well, I asked if I could bring my own food and again she was a little hesitant about it, but told me I had an one hour break where I could do whatever I wanted. So that was at least a little relief for me. We walked around and came to the room where we would have a cooking class two times a week. Again I felt a little anxious but I thought she is just going to show me the classroom... turns out the teacher was still there and the woman that showed me around introduced me to her and braught up my food issues, which again was a huge issue but the teacher said, yeah she sometimes had people that couldn't eat dairy so she would just make adjustment on the day they were cooking (no, thinking of maybe making a different recipe or anything she would only make changes on that said day. Which would be a huge issue for me because what if they made a huge pasta dish with cream, tomatoes and garlic. I could prepare it but not eat any component of it, what am I suposed to omit?). At the end of the conversation the teacher gave me advise (I didn't aks for) for my ibs, where she said just avoid white sugar and white bread, that would really help. I just stood there knodding awkwardly and then continuing the tour with a weird feeling inside.
The rest of the tour I thought about what had happened and why people always get so weird when I mention my ibs. They either play it down, or give unsolicited advie and treat me as if I am not able to take care of myself.
We came to the entrance of the building, where we started the tour and the woman gave me a compassionate look and asked if had any questions before I go.
I always used to just not say anything even if something really bothered me and this time didn't wanted to do the same so told her honestly how I felt.
I said that I felt, because of my food sensitivities, I would always stand out an the focus would be on me a lot. I couldn't be in the canteen with the others (I asked if I could eat my own food in the canteen, she said no) and in cooking class it would be really complicated for the teacher (as i suspected because of her reaction). The woman listened and then asked, if there wasn't anything I could do to get rid of my ibs... (didn't expect that answer, which made me a little bit speechless) I told her no, I try to manage it, but there is nothing really I can do and I accepted it. Which made her give me a look of pity and telling me that accepting it will not be beneficial... or something like that.
I also had other reasons why didn't feel welcome there but that doesn't matter here.
I went home and thought about it a lot, because all the fears I had about telling people about my ibs came true. I actually tried to tell myself that I am overreacting and no one would react like that, though this kind of confirmed to me that my fears weren't just an overreaction, which is so weird.
Now, I know they tried to mean well, but it felt really awkward and as if I am an alien in this program. I didn't attend this program because of how I felt. But I am still thinking about it and wondering if I could have handled it better that's why I am asking: How would you react and handle this situation?