Tickling was always the thing I would never ask for, but always wanted. When my family did it, it felt very strange so I ended up convincing them and myself to an extent, that I hated it, so i felt like i wanted something I hated, and couldnt understand it at all, probably because it was mostly family members doing it and that didnt feel right.
As I got older and "other" people started doing it sometimes, I found that i liked it alot more and started thinking maybe I didnt hate it afterall, and then once sexual thoughts hit me and I learned of all this not just being me, things changed and I embrace it.
The switch happened but didnt happen, if that makes sense, I was indenial about likeing it and then I wasnt, thats the only switch that really happened.
I think alot of people think they hate it purely because family members tickling them when they were younger just made them feel uncomfortable, something that later in life, they didnt feel with select other people.