I see proteanmix's original point, albeit that came off rather childish, inflammatory maybe (better choice of word). The fact of the matter is, MBTI provides a sorting method to categorize human beings--any time you do that, you run the risk of discrimination. (see: race, gender, ethnicity, popularity, clothing style, etc.). The chief point she was trying to make is that it's discrimination--and it is NOT okay.
I'll whine on my little soap box a minute and admit I've had my fair share of flak, ridicule or general ostracism from people where the root cause was just too vague to understand, but in retrospect looked eerily similar to an S/N conflict of personality. Fact of the matter is, I didn't give a shit. I let that stuff slide off my back and keep hauling. If I find a conflict of interest which may directly affect me, regardless of whether it's a stereotypical SJ vs. NT viewpoint or whatnot, I will fight my position and take the battle to my opponent's front door, in whichever format is required to win. (Need to come up with concrete examples on why X won't work but Y will? Sure thing, give me 15 minutes...)
I'll also say that out of all the friends I've ever had, many of my N-type ones somehow stick together with me even after years of separation or loss of contact, while most of my SJ/SP friends have virtually disappeared off the face of the earth to me. This happened even long before I knew about MBTI and S vs. N, and I've discovered the distinction through past reflection. But I don't care, I'll hang with anyone if given the opportunity.
Even then, there are exceptions. An old xNFJ friend left the online forums/blogs I frequented around 2-3yrs ago and never followed up contact. An old ESTP friend from way back in elementary school/boy scouting/etc., I hang out with him every summer at his parents' house near the ocean.