I certainly don't get along with all ISTPs, but I don't get along with every single person of any other type either.
For some reason people tend to think that I'm smarter and more capable than I actually am. So when I voice my worries about something like a college course people tend to not take me very seriously and expect me to do well anyway. Then I'm not only worried about my ability to do the course, I'm also stressed out by their unrealistic expectations. Then people are surprised and disappointed with me when I crash and burn immediately and have to drop out.