^^ agreed.
My mistake was to naively enter in the open market early morning, without realizing I could be perceived as offensive, or at least demeaning. Asking would have helped.
It also feels like people may have lost familiarity with occasionally seeing the random photo enthusiast enjoying the day, possibly also fearing the digital propagation of their image.
Market stall holders are often sensitive about pictures, perhaps because historically at least it was very much a cash in hand trade, i remember my mother getting shouted at trying to take a picture of a impressive cheese stall in the Netherlands about 30yrs ago before GDPR etc so its not a new thing.
So whilst it troubling at the time I wouldnt let it put you off. As others have pointed out the rules are fairly relaxed unless the pictures are for publication.
Its ironic people worry about pictures taken with a film camera, but dont about phone pics that could be uploaded in seconds simply as the latter are so ubiquitous.