How do you respond to people who say they stutter too, when they don't?

How do you respond to people who say they stutter too, when they don't? This happens almost any time I tell someone that I stutter (usually after a block happens during a conversation). They say "oh, I do too!" and might elaborate on getting tongue-tied or stumbling over words, but are clearly not referring to stuttering. If this has happened to anyone else, what do you usually tell them?