Is the average INFP passive aggressive?
No.
What we are is full of emotion and unsure how to handle it. So, when someone we care about hurts us, we're not sure how to soothe our hurt feelings or even how to communicate our feelings to the person who hurt us without also hurting them. So, what do we do? We retreat from interaction with that person because we don't know how to interact with them like a normal human being. 
We're not passive aggressive we're just awkward and confused when hurt.  

    INFP's are highly creative introverts who navigate life through their emotions. Emotion is our sight, sense, smell touch, and taste- it's how we process information. That's a bit of an oversimplification, but that's OK for the sake of a brief explanation. In any case, because emotion is our primary way of processing life, our inner feelings are HUGE. Everything we feel is a big deal, from our apathy to our joy tand disappointment- each of these feelings are uber intense. But you wouldn't know this from the facial expression of the average INFP. Because our feelings are so, soooo much we typically hide them. We don't want to bother people with our drama. Also, we're afraid of being rejected for our intensity. So, we typically keep to ourselves.

     Being brown didn't mean much to me when I was a little kid. But I did notice that I was much darker than most of my friends (duh). I also noticed that even though they were friendly with me, I wasn't actually "one of them," I was a friendly outsider. They'd give me compliments like, "You don't act black," When I was six years old, my reply to that was a smile and a, "Thanks." When I was 8, my reply changed to a grave nod as I'd pretend not to be embarrassed and mumble, "Yeah."  Now that I'm no longer a harmless little brown kid, but a full grown brown woman it means that other (non-brown) women clutch their purse a little bit closer when they see me coming- because brown people are dangerous. It also means that most white men ignore my existence -because checking out a brown woman is weird. And sadly, it means that many brown guys feel free to treat me like trash because of my place on society's totem pole. According to the stereotypes pushed out by our western culture: being brown means I don't actually exist as a woman in the world. That's why you rarely see me in a leading role on television or in movies. It also means I am an angry black woman who is tough and strong and doesn't like "white people." According to this (insane) version of what it means to be brown, a brown person can't be a sensitive INFP. 

​     When an INFP is treated like a "black woman" this means people who are the same color as her joke with her about "white people" and think it's OK to say cruel things about people of other races. The INFP is appalled. It also means she watches her male friends and co-workers treat her fair-skinned female counterparts with respect, taking up for them when they are wronged, and coming to their aid when appropriate. This is nice to see. But then one day the INFP notices that she isn't treated this way. She is not spoken to with respect, nor do these men take up for her when she's wronged or come to her aid when appropriate..that's when she realizes she's being treated like "a black woman." Black women are strong. They take care of themselves. They're not sensitive. They're angry- right? Also, they don't matter as much as their fair-skinned counterparts.
      The INFP reacts by being confused. Her skin is dark, and her heart is an endless ocean of emotion- like every INFP she knows.  But, society will never accept that kind of heart in her kind of skin.  Society will never accept her. So, she realizes she has no choice but to accept that she will always be misunderstood.  

     Being an INFP who is also a brown person is not fun. I think it might be an even lonelier road than the average INFP's lonesome journey through life. I'm beginning to question if the journey is even worth it at all.