I have a job which involves travelling from one place to another and often eat lunch in the car between visits. I recently realised that once a week, whilst I'm eating in the car, three family members are eating lunch at a cafe nearby. Great, I thought, I'll join them! Problem is, I have coeliac disease and none of the lunch options are gluten free (well known chain cafe). The only other cafe nearby is another well known chain with also no gluten free options (this isn't uncommon). I spoke to the people working there once and they said it was absolutely fine for me to eat my own food in the cafe as long as the others are eating. I always make sure I buy a nice drink and it works well for everyone. Not eating isn't really an option because it's quite a fleeting visit already (20 minutes or so) and I wouldn't have time to eat and then join them for the drink.
I don't really think I'm being unreasonable but if you saw me eating my own food would you judge me? I also don't check with the staff every single time even though it's not always the same person I asked initially working there. Do you think the staff are judging me?
YABU - I'd judge you
YANBU - Wouldn't think anything of it