1 year old dog started snarling and turning when being told off

Just want some tips he's a loving dog usually he's hyper like any staff I've ever met gets exited when he meets people he's never bit anyone. I think he gets like it when he gets scared and he gets shouted at, but I don't want to risk him biting someone in my house if they tell him off so I've been thinking about getting him neutered. So yeah just want some advice please