Especially when someone is told to chill out and they don't. Trust me. Stuff has gone down with people who refuse to be responsible for themselves. I've been doing this for 18 years. It's safest to behave with civility. I'm pretty hands off, but I have brought the hammer down hard. Read the UA. Section 2 is particularly useful to be familiar with.
And I think he showed a lot of class apologizing. Adults do that kind of thing when they realize they were wrong. It gets me respect. Not that it's particularly important to have my respect, but it has it's benefits.