<human>: Can you give me the gist of the text in a nutshell?

This in an update to this thread. 

Long story short, a bad situation, stress, and series of unfortunate events along with drinking resulted in my step dad blowing up and yelling at my fiance.. Very rude words. Saying F you, I don't like you, etc. We left immediately. 

He has never ever acted like this as long as I've known him ever in my entire life.. My parents say it was a drunk blowout, and was a once-off terrible random incident that will never happen again. I know he's a good person. We all have drunk moments we regret. This is his. Once in 29 years that I've known him. 

My fiance isn't willing to accept an apology. Won't even meet to hear him out.. Doesn't want him in our lives at all. Is very emotional and unwilling to forgive and forget.. I understand it was very rude and unwarranted, and there's no excuse for it. He wants to apologize but she isn't giving him the chance, or letting her see the other side of him. Just nothing.

Obviously I've stood by her side, she is my fiancé. I agree what he did was wrong, but we should be able to look past ONE incident. Now she's turning against my mom, who just wants us to all get along like a family. I don't know what to do. Totally lost. Suggestions?
<bot>: my step dad yelled at my fiancé. Was a drunken mistake. She won't remotely give him an opportunity to say sorry, so there's no way forward but to shut out my family/parents.