yeah kilitiinko1!
It's not so much about consent as about loss of control. Being tickled makes you blush, sweat, tear up, and might get juices running in other ways. And also in other other ways. Your clothes ride up, your hair gets disheveled, people tease you... I think it's pretty natural for some or all of those to humiliate you. If not, then perhaps you're the sort who can't be embarrassed by anything physical.
I have to side with the people who say being tickled by one person in front of many onlookers is the worst. You're being exhibited to everyone. But if everyone participates, they'll be laughing along with you.