I'm 27(f) now and was a serial dater until I met my current bf. All through my 20s, I did the dating app scene and all I can say is that any guy who does not know how to react to a stutter is an emotionally stunted person who you wouldn't want to be with anyways. Go in with confidence and instead of letting them judge you when you stutter, judge them on how they react to a situation that makes them slightly uncomfortable. Use your stuttering as a quick way to see their true colors.