Pan,
It's a reaction I could/would get from my father when I was still living at home as well.
Instead of checking/offering support, the berating is something I grew accustomed to.
It's more the fact that it happened, and that you should not have done such a thing. He reacted this way especially since it's something after the facts, and apparently you lived through it. An impulse because he did care, and knew I was smart enough to not put myself in those situations.
If the situation was still going on, it would probably be a different reaction. However the reason for the reaction would still be the same.
It's something I have done in the past as reflex with my gf as well...
I've since tried to bite that back and do offer support at the very least at first, if the berating is still warranted after that.
As said before, we're all different people.
However the last part about not talking at all anymore... that does sound very odd indeed, for people you care about.
As for the drunk: I would pretty much have handled that the way you did. Down to the STFU even. You're not alone in that at least
However, keep in mind that he was drunk. I would watch myself a bit for the coming days, but once sober (if he even remembers) he's not likely to actually attempt anything.