Not a name I'd speak in polite company, that's for sure.
It's "good form" to let players know when you have deviated from the usual expectations of the game you are playing. This DM evidently did not do this, so you're justifed (IMO) in being a bit put out by it.
As to your later question, my answer would depend on the language and manner used on both sides of the conversation. It's not rules lawyering to remind a DM about a rule if they've overlooked something, as long as it's done politely. If you were like "You did that wrong! With wrong sauce!!!!", that's probably a bit rude.
Again though, your expectations of playing a standard game were incorrect, but it sounds like you had no reason to know that. Calling you out as a rules lawyer was a bit much, in my opinion. Perhaps he should have just said that it was working differently in his game and left it at that. Obviously that's not what happened, so all you can do is take a deep breath and get on with things.
I'd suggest asking the DM to outline (through a house rule page, booklet, or even a text file) what house rules are being used that are pertinent to the players. That way you have a common ground, and you can be comfortable with playing and all the players can be on the same page. It's important to know the rules you're playing under in any game that humans play. Otherwise it all just ends up being Calvinball (which is fun in its own way, I guess

).
Good luck with your situation.
