It really has to do with values. Everyone has them, and Ns value things in a different way than Ss do. Take a Swimsuit Edition of Sports Illustrated for example. I cant stand frivolous sexiness since it has nothing but show to it, but the Ss I know tend to like staring at something that's good looking for the sheer sensory pleasure of it.
Another thing is that what counts as success in society is based off of the majority, and it's Sensors. Ns value things beyond the see-able. INFPs are powerfully value driven (Joan of Arc, kind of), INFJs value growth and honesty which can rankle Ss who are used to other Ss sugarcoating things (an INFJ WILL be mean if he thinks it'll improve the person in the long run, SPs are more now based)
Well the gist is that Ns are less concrete and sensors cant 'read' people like other Ns can (N can distinguish patterns quickly, unlike S which, usually?, needs to see the pattern first hand. "you dont KNOW that" says the S, while the N is quite sure of their idea.
I'm just running in circles right now... Basically its a clash of the norm (S traits like concreteness and 'having fun' or 'having the most toys compared to the Joneses') versus N traits (Truth of values, understanding things and people, et cetera)
I'm lucky and have both N parents and a charter school with a larger N to S ratio (All the teachers but one are Ns, of the Ns most are NFs). The highschool is scary since most of the people seem so foreign to me (Ss have such a different way of communication sometimes.