Unless they say they are not hiring you because of your speech disability it’s not a legal issue. In certain jobs (not necessarily baking), communication is very important. You don’t want a stuttering person giving out military commands. That would be hilarious. Troops are waiting for the launch command and commander is “lau lau lau lau laun “… Hahaha. That’s messed up but funny. As a stutterer I don’t want to be put in a position where my comms matter for taking critical actions.