A person who hasn't had either of those all their life is likely to not like them
Plus they've had it dinned into them in religious lessons that it's bad in various ways, as strongly as Mormons are told that coffee is bad and as strongly as evangelical Protestants are told that praying before religious statues is bad.
I remember the first time I had lamb... I kind of wanted to spit it out because of the aftertaste
When I first arrived in PL years ago (and was missing lamb, a staple meat where I come from and entirely normal, whereas pork is seen as the poorest and least favoured choice for a Sunday dinner).
I went to dinner with a friend of a friend. Hardly unsophisticated since he worked at the Warsaw office of the BBC. He'd been to Greece on holiday and had cooked Moussaka. The first thing he said, even before his guests had taken their shoes off was: "it's lamb, but don't worry, I've cooked it for so long that you won't taste anything at all".