I am with Rhiannon on this one. If I hate someone, I don't want to touch them and I most certainly don't want them touching me in any way, shape, or form. So, I presume it would be the same way for someone who hated me. With that being said, the examples so far people have been providing in this thread are ones who may not necessarily care for each other. So they enjoy their petty little torments towards each other. But I really wouldn't call it hatred. I wouldn't even consider it a dislike. If the truth be known, with some effort was made, differences could probably be put aside.
However, that is not the same with hatred. Hatred is very bitter and very personal. And if someone truly hates you, they're not going to waste their time whatsoever tickling you. They are going to either want you dead, see you suffer in the worst way possible (i.e. misfortune: terminal illness, death of a friend or loved one, poverty, and of course torture, which BTW there are MANY other ways of achieving this that take much less time than tickling and cause immediate pain and agony as soon as its inflicted with the potential of leaving contusions, lacerations, burns, trauma or scars), or they are just simply going to want to hurt you. Bad. (i.e. maim, cripple, etc.)