You don't know if it will or will not, because you haven't. You only believe you will hurt them, and so you make yourself unhappy for their sake. Midoriya, I do not believe friendship can and should only be positive and kind.

[ His expression softens. ] Granted, I am not saying that you should get into arguments for no reason, or be cruel. No, I doubt you have it in you to be cruel. But not every single thing you give another person will be "good." And all you want to give them is "good," then they will never come to know who you are.

[ Kei sighs just a little. ] You're welcome. What I'm giving you now is not "good" either, but... it seems no one else has said it. [ And he's feeling somewhat guilty about giving spicy food, like it is putting salt on an open wound. ]