When I was younger "fight or flight" were the only two options I knew that I had and, prefering harmonious relationships with others, "flight" was often my choice.
When I was aggressive I would later not like the feelings of guilt/shame I'd have for violating my values system. But "flight" left me isolated and unhappy.
So, with time I figured out that I needed a few other options and set about learning about my wants and needs and how to get them met. I picked up some good communication skills along the way and that has helped a lot.
In extreme stress I feel narrowed to the old two again and, if I have time to think before I act, I can call out the other choices.
I think I have potential for pretty serious, even criminal, aggression and am glad I have some control over it.
"No ray of sunshine is ever lost, but the green which it awakes into existence needs time to sprout, and it is not always granted to the sower to see the harvest. All work that is worth anything is done in faith." - Albert Schweitzer
I get the descriptions from posts like that, as well as from profiles.
Since the INTJ is introverted, they will not be as aggressive as an extraverted TJ. But it's still there.
With the INFP example given, it was reactive as I said, in contrast to the normal pacifism. (Is the point of the OP who is EVER aggressive; or normally? The key phrase I was focusing on was "I'm very focused on reaching my goals, in every arena. Many have called my mindset relentless and aggressive.")
It is whether or not certain types have a strong inclination towards aggressive behavior.