Yeah there's a Ti-Fe duality at play here, as I've noticed it in several INTPs. When a piece finally falls into place in our brains, it's there forever, potentially. However, our inferior Fe may prevent us from accepting other viewpoints out of politeness, and we potentially can even become emotionally fueled by opposition to what we pride as correctness.
I've had the good fortune to be very good friends with several INTPs over the course of my life, and I've realized that a small group of INTPs that agree with each other is a very fun time (Ne hilarity ensues), but when INTPs disagree (which will happen often due to the ultimate subjectivity of our logical frameworks), it can be an absolute bloodbath.
A lot of the behaviors people here are projecting on Fi-doms are true of other types as well, though the mechanisms/background behind those may be different.