Here's what happened, you started off the flight by making a bad impression and the FA's were most likely gossiping about you a lot after that. Person of interest with a negative connotation.
Frankly what you did is pretty weird in my opinion, I have never seen someone board and then try to get off the plane for air while others board. FA told you not to, and however dumb you might consider that to be it is what it is... and then your new solution is to stand up front next to the FA's as they greet boarding passengers, how awkward.
So while bad service is not an acceptable reaction to the bad first impression, that is probably the reason it happened... first impressions stick.