I was going to reply with a bunch of examples from games I play in but changed my mind. Aside from the gossip value, it didn't really add to this discussion. There are a few things that I personally consider notable and a few questions:
- He's a reg
- This is not normal behavior for this player
- He was informed several times about rules and wanted to just do whatever he wanted
- He got angry when he didn't get his way and left
A few have asked about alcohol being a factor. This would be useful information, definitely.
Personally, I give a LOT of latitude to regs as they are the heart and soul of a regular game but even so, rules are there for a reason. I would certainly follow up with the guy the day after. If he is ghosting you then I'd say take him off the invite list until you've had a chance to at least talk about it.
Once you do talk, try to find out what was going on with them. None of us are immune from getting weird from time to time and it may just be that the dude was having his worst day, he lost a hand/hands that just tilted him and wasn't handling it well, he had some sort of issue with another player that was irritating him. Any of a number of reasons why a usually well-behaved guy gets weird out of the blue. Once you get some sort of response there, you are basically left with figuring out how you feel about things. It could be anything from, "this guy is bad for the game and won't accept being told repeatedly that he was in the wrong - don't invite back", to "dude just went off the rails but feels bad about it - maybe he reaches out to offended parties and apologizes", or even "no one else in the game gives a damn about this, he's good for the game - invite back".
This is very different from a new player acting like a dumbass. Those guys just don't get a second try. They are just not coming back.
Last thing, try your level best to not take it personally. I'm not saying if he was making everyone there uncomfortable including you to just let it slide. Rather, I mean, check yourself as you reach out to try not to let any personal frustration from the moment influence how you deal with them.
Good luck. Every regularly running game will have these things happen from time to time. As the host, the ultimate authority is you. If you don't want them there, then don't invite them. Hopefully, things cool down and any ruffled feathers can be smoothed down and get back to normal.
Shuffle up and deal.