Not exactly proof, but Kai did nothing wrong. There is no proof of what happened. Please don't pick a side for now, blocking him is completely fine. Regarding all the drama, he has deleted his spacehey account for getting accused of "sexual harrassment" and it's disgusting. Leave him alone. He's been through too much for this.
What Michael and Kai did was nobodys buisness, and even if it was, it was 100% consented. Yes, he did make out with Michael in a stall, but no, he did not sexually harrass anybody during the incident. He even asked Michael if he was comfortable, and he said yes. (From what Kai has told me)
And not only that, before everything, before Michael had blocked him, Kai told Michael to make a bulletin of how it was consented because he didn't want to get in trouble with anyone, or anything. I'm good friends with Michael aswell, why would he do this? I know him in real life, and even my friends, lani, tobi, and lucas, know that it was consented. Leave him alone.