I think the key point would be to avoid reaching that point. Drive the conversation in a way that you won't misread anything. You ask questions and complete all the gaps possible before jumping into any conclusions.
And boom. Civilized conversations appear. Listen first.
@get_elevate you mean, for example I can know by advance that the person I will talk to is angry? Or sad? .. And then I can make a joke and see if it's working and it changes to "having fun" or something like that?
Never judge person on the first meeting because not everyone shows there true colours. Examples, imagine we both met today. We both will show ourselves as a good person. None of us will tell yo man, I am here to steal your company.
I saw some movies and they usually show to judge a person. Keep an eye on him when he talks with janitor or someone with not upto his status.
Lastly, always check person expressions (tho some are masters) but you can get clue.