Chances are, they never will. Depending on who they are, you should just say something along the lines of "I'm glad your alright now, I'm still hanging in there" and move on with your life. They won't understanding what someone like you or I go through unless they have firsthand experience themselves which is unlikely. If they are of a closer relation to you, you can talk about it every now and then. Help them understand it even a little. They won't understand what's it's like to have a word be unable to come out even though you're trying your hardest to push it out. They won't understand what's it's like to speak like a monotone robot for the sake of controlling your stuttering. They won't understand what's it's like to have that twitch when a word you didn't think would get blocked ends up getting blocked. They don't know what's it's like growing up with people telling you that it mostly goes away with age, wishing for it and ending up being disappointed and angry. And that's fine because you shouldn't assume they will and why would you even tell them such things? So they can pity you? Chances are, they can't help you even if they know your experiences. At the end of the day that person is doing what he/she perceives to be nice. Just accept it and move on. Focus on their intent rather than their content.