What do you say?
Can’t speak for Riles but if I am selling something I only want to negotiate on in person I just respond with, “come take a look at it and we’ll talk.” This also helps weed out people who are just throwing out offers on multiple listings and narrows my interactions to those who actually want the specific item I am selling. I don’t do this for everything I sell, but there are times I don’t want to mess with text or phone call negotiations.