Recognizing Fake Stutters

Recognizing Fake Stutters In movies and other media can you pick up on if an actor is faking a character's stutter? 22M, I've had a stutter my entire life and every time I come across a character with a stutter in a movie or a show I can normally tell if the actor actually has a stutter or not. I'm not offended if an actor is putting on a stutter, it's just a fun game I like to play. Wondering if anyone else can pick up on the same thing?