On the matter of "defending yourself," I'd like to suggest--but I'm doing it with baited breath, because we're basically strangers and I'm wary of giving even my best friends unsolicited advice--that you shift that mindset a bit.
(1) I think you're going to get a lot more out of whatever follows if you approach it in the spirit of "hey, I'm newish here, I don't mean to bang anyone's nose, I'm trying to follow the cues I see, but I clearly goofed there somewhere, can you take five minutes to talk through the other day's conflict with me?"