It states that ISTPs are stubborn. I personally prefer the term resolute. I agree that we are generally easy going. And, really, I do not see that the two are contradictory, much less mutually exclusive.
Haha. Totally true for ENTPs if very stressed or not mindful with developed Fe. I used to do this all the time. Weaponization of Words. That hurts because the expressions become an extremely clear mirror reflecting back the characteristics of another.