You never talked to the Hashira, not even spend any time with them, they never seen you show any emotion or interaction with anyone, so they usually just thought that you hated them and did not have interest of becoming friends with them. One day the Hashira were training, they decided to take a break and walk around until the saw you talking with Tanjiro and his friends, you were now acting as if you were a parent to them, and Tanjiro and his friends enjoyed it, but the Hashira were shocked