How is it for no reason, he literally told you that you disliked his thread for no reason and that's why he gave a negative reputation. You are also acting like an immature child, making a thread here and asking people to dislike someone threads.
He shared Nord Vpn accounts for free, and you decided to randomly give him a dislike. The best part is the you never even responded on that thread. I can understand if he posted accounts that are not working, and you know this because you checked just after he posted them, so you give him a dislike. But you never even replied so you didn't have a chance to test his accounts, instead you just left a dislike.
Now when he gave you a negative reputation back, you are bitching about it and making threads.