Akin to blackface? Yeah not at all. It is a learning tool. Put yourself in those shoes. See how it feels. Any professor worth their salt will have you do this! Decide how you want to pseudostutter, repetition, prolongation, or block. Go to the store and ask a employee to help find something. Stutter your rear end off. Make it loud since you have a mask on. Let the pain and humiliation run through you. THAT is what people who stutter have to deal with every single day, every time they talk.