Sorry to hear that. I had an opposite experience recently where I stuttered through the entire interview but they didn't bring it up even though I could barely get a sentence out. It was a shame because I did have a lot of relevant things to say but was just trying my best to make words come out of my mouth so I wasn't able to say all that I wanted. Ironically, it is usually interviews for jobs I care about and actually want where I stutter more while jobs that I am not exciting about I can typically interview for without stuttering.