My contention is that the two-variable power hierarchy in society looks like this: SJ > SP > NJ > NP.
SJs have the most power because:
When most people say "skills", they mean "SJ skills". When most people say "intelligence", they mean "strong Si and Je" (even if they don't use those terms), "factual knowledge", and "strong work ethic". Other skills don't count. SJs and everything about them are considered "normal"; by definition, then, everyone else is "other". In a more literal sense, SJs are 50% of the population (though estimates vary), and they probably hold more than 50% of the positions of power. The schooling and working worlds are designed for SJs to succeed, because they are held together by SJs.
SPs have second most power because:
We are a relatively prevalent temperament at 30%. There are enough SPs that some skills associated with strong Se are seen under the intelligence umbrella. Enough SPs that we are still seen as actual people.
NJ > NP in the hierarchy because NJ has top-two Je, which is also an SJ skill. The world seems far more stacked against Ns. I'd guess many feel devalued as people when their talents are invisible to or rejected by others. (This is just a guess. Please correct me.)
Now I think I understand why some Ns on this forum have an anti-S bias. IRL, Ss are unintentionally oppressing Ns most of the time. Some Ns find their sanctuary on an MBTI forum with favourable numbers (N > SP > SJ) and don't like it when we (S types) invade it to complain in the face of pro-N biased comments, or say we don't feel welcome on this forum, etc. Because a lot of Ns don't feel welcome in the world altogether, they are the victims of anti-N bias each and every day, etc. (I'm just guessing. Again, please correct me. The last thing I want to do is replace your words with mine.)
In comparison, I think I have no right to complain. I have the entire real world (mostly) in my favour, it would not kill me to let the Ns have this forum. I am sorry for being ignorant of this until just now.
All of this is open to correction, discussion, etc. and feel free to tell me I am just wrong. I apologize for any incoherence, I haven't slept in a while.