Everything that irritates us about others can lead us to an understanding of ourselves.
I know from my own experience that when you tick me off, it's probably because you're doing something a) I was always told not to do, or b) I want to do, but am too chicken. Either way, my knee-jerk reaction is going to be petty, begrudging, and resentful. I'm going to want to put you down so I don't have to feel so bad about myself. You're triggering something in me that still needs work to be integrated.
Type knowledge is really helping me understand the so-called Shadow functions, those that are unconscious, active below the surface, mostly bubbling up when I'm sick, tired, or stressed. You know those moments, when words are leaving your mouth as soon as you hear them you're aghast and wonder, "did I really just say that?" I've had plenty of those. They are great learning moments. Tough, but easy to remember, thanks to the strong emotions connected with them.
Let's take a moment to clarify that people with a "J" in their type code are not necessarily judgmental. Yes, J is short for Judging, but what that means in MBTI® theory is the function expressed in the extraverted attitude, what you're letting others see, is either Thinking (Te) or Feeling (Fe). When you have a P in your type code, it doesn't mean you're necessarily more perceptive, but that you're showing your perceiving function, Sensing (Se) or Intuiting (Ne), to the outside world.
How prejudiced are you, really?
Our cultural upbringing is going to play a big role in what is important to us; shaping our values. Someone violating those values will also trigger a judgmental response. Since our limbic brains are still conditioned to operate with a "Be Like Me" program, it's much easier to call someone "lazy" or "incompetent" if they do things differently. Believe me, when you're moving to another country or start working with an international team, that's going to happen a lot.
To appreciate the validity of the different approaches, we have to activate our neocortex and start considering the context that the other person is operating in. This is a conscious exercise, and our brains generally don't want to do a lot of work, so the judgmental or stereotypical response is easier to stick with. My opinion is that a stereotype in and of itself isn't bad, only insisting on it without examining the circumstances or accepting evidence of the contrary is.
You'll be asked to associate descriptions (good / bad) with e.g. race (black / white), self (you / others), size (big / small), and other items, depending on which assessments you choose to try out. It's truly insightful, so I hope you can take some time and perhaps even share your results with us.