Ahhh… the parents. A colleague at work – in his mid 30s, white, ultra-nerdy – is religiously into Parliament and ‘blues guitar’. (I had never heard of Parliament before, and during my **‘formative’ stage in music consumption, I was mostly into classic/prog rock.) He listens to nothing else. I asked him about that; his mother (also white) brought him up on what she liked: funk and blues.
Also (with he being ultra-nerdy… a term which I do not use lightly), I’ve surmised that he was to some extent isolated from those in his age group who would have exposed to other genres.
**The very early part of that stage was filled with my folk’s penchant for mid/late 60’s pop; Motown; and (from mostly my mother) Broadway show tunes. All of which I still enjoy.