Cats, growing up, my parents were VERY vocal about hating cats. So I grew up thinking I hated them too but never really thought about why. Then one day when I was a teenager, DH (then BF) took me to meet his aunt and I also met her cat who was a lovely thing. I sat there and thought about why I hated cats, and I came to zero conclusions. It slowly dawned on me that I didn't hate them after all, I actually really like them! We're hoping to get a cat at some point this year and I can't wait 🙂
Jack Russells, my parents were also pretty vocal about really disliking them too, "Horrible yappy things" and the same with cats. I always thought I didn't like them too until I actually thought about why I didn't and came up with no answer.
Meatloaf (musician, not food)
Queen (band, not the Queen)
Ford cars, both my parents despised them, my dad probably still does but my mum is now on her second Ford and she loves it, me and DH are also on our second Ford and it's definitely our favourite car we've ever had so far!
Anyone else?