It's what kids do. It's why they need parents. They're immature. They don't always handle situations well. You teach them. No need to be mad or embarrassed about, IMO. Let them know a better way to handle it and what the consequences will be if they don't.
I would have taken my daughter home, too. That kind of attitude can ruin a good team, quickly.
Find out what was wrong, chances are it wasn't softball.
I remember every kid in the last 25 years, that made a butt of themselves. One was that long ago. He was 5 and laid down in the middle of a soccer field and threw a tantrum for 5 minutes. He obviously wasn't mature enough, to play a sport like that. I would have withdrawn him and tried again next year.