No, I don't think I could be in such a relationship. Now, for a time, we'll neglect the fact that I'm not interested in relationships and am avoiding them because I see little to no use in them. We'll just suppose that I am interested in relationships.
Now, in such a case, I would be entering a relationship for enjoyment, not obligation, and I would be looking for us to be equal in this. That means us both being happy.
I would never break up with someone I love, just because they weren't into my fetish/hated it. I'm sorry but to give up love over something like that is stupid. My fetish doesn't define me. Its not life or death, its not like I can't live without it.
And for the people who say "If they really loved you, they should be able to explore your fetish/interest whether they hate it or not." Same can go for you, you should be able to respect their desire to not be tickled, no matter if you like it or not.
Id have to break up, i think if someone loves you enough to be with you for life they should atleast be fair and explore yours and their fetish/interests even if they cant stand it.
Now, in the above quotes, at least one partner is being neglected, at least their sexual desires are. One would have to 'adjust' to the other, either by accepting tickling, or accepting no tickling in a relationship.
To me, sex is important in a relationship. If we're not having sex, best be friends. And no, I'm not willing to sacrifice my own needs in a relationship, because that would make me unequal. And for a girl to have sex with me just to be in relationship, I couldn't accept that either, because she would be unequal then.
The same goes for tickling. If I was forced to take out tickling, I wouldn't be happy with sexual life, and I would be more and more unhappy and frustrated. Even with the most sweetest of girls, if she was the reason I was blocking what I like, I would slowly become annoyed with her and would slowly start hating her. Again, if she was forcing herself into my fetish, she would be unhappy, too, and would start hating it more and more. Either way, one is unhappy, and one must give up their needs for the other. That is not equality and happiness one needs in relationship.
So, call me superficial and whatever you like, but the answer is no, I wouldn't be with a person who hated/couldn't accept my fetish.