My Aunt was a queer old duck! When she lived with us for a while she tried to get the whole family to go raw food! Nope. Not having it!
She had loads of fads. She demanded soya margarine wherever she went but in her later years I noticed Anchor butter in her fridge! She then denied ever eating soya Margarine, even when Mum reminded her that she insisted the lady in a local shop where they were on holiday, get some in!
She was all about hating fat and too much sugar (everything was too sweet -oh and before you think well ok that's her taste, I should tell you of all the cakes she had in her pantry - including some apple cream turnovers that really should have been in the fridge but there was no room in the fridge with all the chocolate cake and Colin the caterpillar cake!!!).
Anyway, taking her for a meal was erm...interesting! Finding something she would actually eat! I did take her to a cafe in the New Forest where she decided to have a baked potato with Prawn mayonnaise. She thanked the staff profusely for a lovely meal. Days later I was telling mum in front of my Aunt that we had gone to the cafe and what we had eaten. Cue Aunt "Well,,,,it wasn't very nice!|"... She had cleaned her plate...
It was also a bit uncomfortable when eating out with her as she would constantly look around at other people, commenting on their appearance! She was obsessed with tattoos, telling my mum that every baby was tattooed (that was when we realised she was going a bit funny!).
However, she was never rude to staff/shopkeepers. On the contrary, she would sweep in like Lady bountiful and wish them all a good day as she swept out again!