Honestly, I've never had this problem. There hasn't been a girl I've tickled, ether friend or girlfriend, that hated being tickled; even the ones that were extremely ticklish. I don't think most people hate being tickled, I actually think there might be a very small percentage that does, as long as you don't go overboard or tickle obsessively I feel it shouldn't be an issue. Now, if you're talking tickle sessions I can see the majority of people being against that, and it seems a lot of people with tickle fetishes but to take it to that level. But just playful tickling, that usually lasts a few seconds, isn't an issue. Although a person can not be in the mood to be tickled even if they aren't a very ticklish person.