I think "privilege" gets overused in some circles, especially when it just winds up looking like the exact reverse of what I've just described, but the tendency to just outright disregard the perspectives and experiences of other groups seems like a pretty prominent example of privileged thinking.
Well, "white, straight, upper middle class male" is the default setting in our culture, and has been for a while. That's the "normal" perspective, which often gets conflated with "reasonable."
The tendency, I believe, is to think something along the lines of, "I'm a reasonable person, I didn't intend to do anything offensive, and I can't understand why you would be so bothered by it, so you must be simply making a fuss for no good reason."
Now, as Koz points out, that might actually be true
. Sometimes people make a fuss over something for no good reason.
Other times, it just doesn't seem like a "good reason," because try as you might, you can't actually put yourself in that other person's place and appreciate why they are upset about it.
For me, the shift in my thinking on this is when I realized that the conflict here is between focusing on "Well, I think I'm right," instead of focusing on "This person has been upset by my actions."
Being "right" shouldn't be more important than making sure you don't actually hurt other people.
It's basically telling someone your characterization of their personal experiences trumps their own.
This is a really good insight. It's really easy to invalidate another person without meaning to --one of the easiest ways to accidentally disrespect another person in a fundamental way.