Being yelled at: Our brain on alert in a flash. What happens within the brain when it perceives a threatening signal, such as an aggressive voice? Researchers have studied brain activity during the processing of various emotional voices. They discovered that we notice a voice much faster when it is considered threatening than when it is perceived as normal or happy. Our attention is more focused on threatening voices to enable us to clearly recognize the location of the potential threat. Source 5v.
Threats and shouting usually results with me raising an eyebrow and think little of it. But that is the result of a youth of bullying and growing up better than them. Also, shouting never supports the point of your argument, but that's logic thinking which isn't always present when the heat is high.
I think the main thing of it is the intent behind the threat, which varies hugely.
I am one that reacts in a very bad way to threats. If you threaten me or my loved ones when I am around you best be ready to defend yourself because I will step up to you and tell you that any threat you just made is not going to happen without me making good on you being hurt. I carry a gun and I am not afraid to use it to defend myself or my loved ones.
If you are just yelling and saying things I will ignore you and walk off.