Hi, Rosencrantz
You've brought up another very interesting topic. I must confess, I found myself grinning a bit when I read your post because I too have an issue with being patronized. In fact, whenever this has happened, I morphed into some fanged, protruding lower jaw monster who is out for blood! Yup, it's a fair statement that being patronized grates me just a tad, too.
Why does it produce such a reaction? Well, in my case, I feel it's an attack on my sense of voice, which I've toiled so utterly to obtain. To me, being patronized is much worse than normal abuse because not only is it designed to render me voiceless, it is also designed to make me feel like I'm an idiot/that I should feel remorse for even trying to think independently ...it's a double pronged attack and I reject it utterly.
How to handle it? Hmmm, well, obviously I haven't handled it well in the passed

But, my plan for the inevitable future occurrences is to remain calm (jaw back in Rojo!) and calmly call the person out on it. Something along the lines of nicely, but firmly stating, "Look, I feel your statements are patronizing and that is not acceptable to me." The person will either have to rephrase their remarks or the conversation will be terminated by me.
Dr. Phil has been on our airwaves a lot lately and something I've heard him say several times now is that "We teach people how to treat us". That resonates with me and that is why I've thought about how I'm going to deal with the patronizers I run into, in the future.
Is patronization an N calling card? It can be but I don't think it's anywhere near an absolute indication. A lot of patronizers are just plain a-holes. Are we ACONS guilty of it? Perhaps at times but I don't think it comes from us being a-holes, or N's. I think it comes from the "rescuer" instinct, which is often highly developed in us, and this can get us in trouble when our help has not been solicited. I try very hard to step back from people in an emotional situation because I know how vulnerable their vulnerability makes me. What I try to do is offer support but I try not to jump in unless I've been asked to, and I can do so without hurting myself. Also, I don't think there's anything wrong with saying to someone, who's asked for my help, that their situation is too close to the bone for me and that I probably am not the best person for them to turn to, because I will become too emotional to be constructive.
R, I think giving it to people right between the eyes is always the best approach. Obviously being completely straight with people should be done in a caring way but it should be straight talk nonetheless. If anything, I've found it's the people who have trouble with straight talk who are most likely N's.
Thanks for bringing this up.
God bless,
Rojo